What Is Split Second in MTG?

The Short Version

Normally, casting a spell opens a window. It goes on the stack, every player gets priority in turn, and anyone can respond before it resolves. That window is where counterspells live, where "in response, I sacrifice it" lives, and where most of the arguments at a Commander table happen. How the stack works →

Split second closes the window. While a spell with split second is on the stack, nobody can cast a spell or activate an ability unless it makes mana. Not the opponent, not you. The spell resolves and then play continues as normal.

That is the whole mechanic, and the name is the flavor: the spell happens too fast for anyone to react to it. What makes it worth a page is that players consistently round it up to "uncounterable," which it is not, and the gap between those two things decides real games.

The Rule, Exactly

Split second is a static ability that only does anything while the spell is on the stack. It is not a property of the permanent it might become, and it is not a cost or a trigger.

Three details in that sentence do work. "Only while on the stack" means the restriction ends the instant the spell resolves or otherwise leaves the stack, so the next object on the stack can be responded to normally. "Players" includes you: you cannot chain a second spell behind your own Krosan Grip. "Aren't mana abilities" is the one carve-out in the rule itself, and everything else that gets through does so for a different reason.

Worth saying plainly, because it is the most common misread: casting a split second spell does nothing at all to what is already on the stack. If an opponent's counterspell is sitting there pointed at your commander, Krosan Grip does not clear it. Split second stops the next thing anyone would do, not the things already done. Priority and responding to spells →

What Still Gets Through

Split second stops two specific verbs, casting and activating. Anything that is not one of those two verbs is untouched, and there is more in that category than people expect.

Triggered abilities are the big one. A trigger does not require its controller to have priority or to do anything at all, so split second cannot touch it. That includes triggers that counter your spell. Chalice of the Void reads "whenever a player casts a spell with mana value equal to the number of charge counters on this artifact, counter that spell," and it counters a split second spell exactly as it counters anything else. This is the concrete reason split second and uncounterable are different words.

"Mana ability" is wider than it sounds, and this is where people get caught. A mana ability is not just tapping a land. Any activated ability that does not target, is not a loyalty ability, and could add mana is one, which means Ashnod's Altar and Phyrexian Altar are mana abilities and can still be activated while a split second spell is on the stack. So "sacrifice it in response" is not uniformly off the table: it depends entirely on what the outlet gives you. Viscera Seer scries, so it is stopped. Ashnod's Altar makes mana, so it is not.

That matters most against the split second removal that targets a creature. Sacrificing is a cost, so it happens immediately and does not use the stack. Point a Sudden Death at a creature whose controller has Ashnod's Altar untapped and they can sacrifice it in response after all, leaving your spell with no legal target, which means it is countered on resolution for exactly that reason. Two mana is not nothing to them, but the window you thought you had closed was open the whole time.

Special actions are the fun one. Turning a face-down creature face up does not use the stack and can be done any time you have priority, and you do still get priority during a split second spell. Your options are just narrow. Narrow enough to include Willbender , whose morph trigger changes the target of a spell or ability with a single target.

Every Card That Has Ever Had It

This is a short list, and that is the point. Split second debuted in Time Spiral in October 2006 and twenty-one cards have carried the keyword in the twenty years since. Two thirds of them arrived in the first seven months.

The shape of that table is the story. Fourteen cards across Time Spiral block, then nothing at all for twelve years, then a slow drip of one or two per year starting with Sudden Substitution in Commander 2019. Note where the recent ones come from: a Commander deck, a Modern Horizons set, another Commander deck, a Universes Beyond Commander product, another Modern Horizons set. Not one of the seven cards printed since 2007 came from a premier expansion.

Krosan Grip ↗

The famous one. Three mana to destroy an artifact or enchantment, and the extra mana over Disenchant buys the thing Disenchant cannot do.

Trickbind ↗

Counters an activated or triggered ability, and shuts off that permanent's activated abilities for the turn. One of the cleanest answers to a trigger-based combo.

Sudden Spoiling ↗

Creatures a player controls lose all abilities and become 0/2 until end of turn. Answers a whole creature combo at instant speed, with no window to go off.

Extirpate ↗

One black mana, name a card in a graveyard, exile every copy from graveyard, hand and library. Graveyard hate that simply resolves.

That pattern is not an accident, and the designer has said so. Mark Rosewater rates split second an eight on the Storm Scale, his ten-point measure of how likely a mechanic is to return to a premier set. Asked in 2022 why a mechanic players clearly enjoy sits that high, he answered that it "has baggage that might not be apparent to you. For example, it confused a lot of players and had some play design issues," and then added the part that has aged into a good prediction: "I do think we'll see split second again, but more likely in a supplemental set than a premier set."

Angel's Grace ↗

You cannot lose the game this turn and damage cannot take you below 1 life. The only split second card that answers lethal rather than a permanent.

Sudden Substitution ↗

Exchange control of a noncreature spell and a creature. The 2019 card that ended a twelve-year gap in the keyword.

Legolas's Quick Reflexes ↗

Untap a creature and give it reach, hexproof and a tap-to-ping trigger. Protection that cannot be answered, which is most of why it costs what it does.

V.A.T.S. ↗

Destroy any number of target creatures with equal toughness. A split second board wipe, if the toughnesses line up.

Two cards are worth an asterisk because they do not have split second printed as a keyword. Molten Disaster from Future Sight has it only if you paid its kicker, making it the sole card where the ability is optional. And Shadow the Hedgehog , from a 2025 Secret Lair, grants split second to your spells whenever artifact mana helped pay for them, which makes it the first card to hand the ability out rather than carry it.

The remaining keyword cards, for completeness, are Wipe Away , Sudden Death , Sudden Shock , Word of Seizing , Stonewood Invocation , Celestial Crusader , Sulfur Elemental , Take Possession , Quagnoth , Sudden Edict , In Too Deep , Inventory Management and Siege Smash . The last four creatures and Auras on that list are a reminder that split second does nothing once the spell resolves: a Take Possession on the battlefield is an ordinary Aura, and Quagnoth's shroud, not its split second, is what protects it afterwards.

Why It Earns a Slot

In Commander, the reason a game-ending play resolves is almost never that nobody at the table held an answer. It is that the answer needed a window and the window was defended. Split second is the one keyword that buys the window outright.

The Krosan Grip case is the whole argument in one card. Disenchant destroys an artifact or enchantment for 1. Krosan Grip does it for 2. One extra mana, and what the mana buys is precisely the case Disenchant loses: the combo player holding up two mana, the artifact with a sacrifice outlet attached, the enchantment whose controller kept Heroic Intervention in hand. Against an open board with nobody representing anything, Disenchant is the better card. Against the situations you actually keep removal for, it is not close. When to use removal in Commander →

The same logic scales across the rest of the set. Trickbind answers an activated or triggered ability, which is the layer most combos actually win through, and cannot itself be answered. Sudden Spoiling turns a player's creatures into abilityless 0/2s at instant speed, which dismantles a creature combo mid-assembly without giving anyone a chance to respond. Extirpate is one mana of graveyard hate that simply resolves, against a deck whose whole plan is the graveyard. How to spot a combo before it happens →

The honest counterargument is that you pay for this every game and cash it in some games. Split second cards are consistently a mana above rate, and that mana does nothing at a table with no interaction. A casual pod that never holds up mana makes Disenchant strictly better and Krosan Grip a tax you volunteered for. The keyword is a meta read, not a free upgrade, and it gets better the higher the bracket goes. The Commander bracket system →

What They Cost

Here is the genuinely useful part for a deckbuilder: split second is cheap. Thirteen of the twenty-one cards carrying the keyword have a printing available for under a dollar, including Sudden Edict , Wipe Away , Word of Seizing , Siege Smash and Extirpate . Krosan Grip itself sits under two dollars despite being the best-known card in the group, because nineteen years of reprints have done their job.

Only one is genuinely expensive. Legolas's Quick Reflexes was around fifty dollars in September 2026, and that price is about a single Commander-deck printing meeting steady demand rather than about the keyword. Trickbind and Sudden Spoiling are the other two that ask for real money, in the high single digits to mid teens. Prices move, so treat those figures as a shape rather than a quote, but the shape has held for years: the effect is strong, the supply is old, and almost nobody has priced it in.

Samut, and Why Reality Fracture Matters

Split second is in the news because of a preview card. Samut, Tyrant of Naktamun , revealed during Reality Fracture preview season, is a 1 legendary 2/1 whose entire text box reads "instant and sorcery spells you control have split second." Our full Reality Fracture set preview →

Two things make that notable beyond the card itself. The first is that it hands the ability out unconditionally, to a whole category of spells, repeatedly. Every previous case has had a string attached: Molten Disaster wants its kicker, Shadow the Hedgehog wants artifact mana. Samut asks for nothing.

The second is where it is printed. Reality Fracture's main set is a Standard-legal premier expansion, and as the table above shows, split second has not appeared in one since Future Sight in May 2007. Rosewater's guess that the mechanic would come back "more likely in a supplemental set than a premier set" held for nineteen years and seven cards. This is the card that breaks it.

As for how it plays, the obvious tension is that split second protects your spells and does nothing for Samut. A 2/1 for two that turns every instant you hold into an unanswerable one is a creature the table has every reason to kill on sight, and they get to do it on any turn you are not casting something. Whether that is a real Commander deck or a cute two-card combo enabler depends on how much protection the shell can spare. How much protection a Commander deck needs →

Standard preview-season caveat applies: Reality Fracture is unreleased as of this writing, card text can change before a set ships, and nothing here is a purchase recommendation.

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