Card Spotlight
A 2-mana blue instant that untaps all nonland permanents you control. Imprinted on Isochron Scepter with nonland mana sources making three or more mana, it repeats for unlimited mana.
Commander Spotlight
Dramatic Reversal ↗
A 2-mana blue instant that untaps all nonland permanents you control. Imprinted on Isochron Scepter with nonland mana sources making three or more mana, it repeats for unlimited mana.
See Dramatic Reversal's full stats and printings →
Dramatic Reversal is an instant, so it can never be a commander. It is played in the 99 of blue decks, almost always next to Isochron Scepter.
It belongs in blue decks running a dense package of mana rocks, ideally with Isochron Scepter and a way to spend unlimited mana. Without the Scepter it is a modest ritual that depends on how many rocks you have out.
Isochron Scepter ↗
The other half. It casts a copy of the imprinted Reversal for {2} and untaps itself with every copy.
Grim Monolith ↗
Taps for {C}{C}{C} on its own, so it covers the full three mana the loop needs with one card. It is a Game Changer.
Aetherflux Reservoir ↗
Every copy cast gains you life equal to the spells cast this turn. Once you have 50 or more life, pay 50 to deal 50 damage to any target, and repeat.
Thrasios, Triton Hero ↗
A commander that turns unlimited mana into cards: {4} per activation scries, then puts a land onto the battlefield or draws a card.
Dramatic Reversal is inexpensive. It has been reprinted at common, most recently in Avatar: The Last Airbender Eternal, and the regular printings sell for very little. It is an easy card to own if you are building the Scepter combo.
Imprint Dramatic Reversal on Isochron Scepter as the Scepter enters. Tap your mana rocks and dorks, pay {2} and tap the Scepter to cast a copy of the Reversal, and the copy untaps the Scepter and every rock and dork. If those nonland sources make three or more mana, you end each pass with at least one more mana than you started, and you can repeat it as often as you like.
Imprinted cards are exiled face up, so the moment the Scepter resolves you can see Dramatic Reversal under it. From there, count the player's nonland mana sources. If they make three or more mana, the combo is live, and the window to act is before they untap with the Scepter, or in response to the Scepter's activation.
Most tables treat it as one, because the mana rocks it needs are already in any deck that runs it. Neither card is a Game Changer, but Wizards' bracket rules keep two-card infinite combos out of Brackets 1 and 2 and early-game ones out of Bracket 3. A deck running this pair with a fast rock package belongs in Bracket 4 or 5.