Precon Upgrade Guide
What to cut, what to add, and how to play the Dimir surveil and reanimation precon from Murders at Karlov Manor, commanded by Mirko, Obsessive Theorist.

Murders at Karlov Manor
Revenant Recon
Graveyard value takes some sequencing. Out of the box, before any upgrades. How we rate precons
Buy Revenant Recon on TCGplayer →Revenant Recon is a graveyard deck that gets a free creature back at the end of every turn once its commander is big enough. Mirko, Obsessive Theorist grows each time you surveil and returns creatures with less power than it has, so the deck rewards cheap surveil spells and creatures with strong enter-the-battlefield effects. It is held back by a 1/3 commander with no protection, colorless lands in a two-color deck, and several expensive cards that are big but have too much power for Mirko to bring back.
TurnZero HQ rates Revenant Recon a 3 out of 5 on difficulty and a 3 out of 5 on power, as it comes in the box. That is our editorial read, not an official Wizards rating. The full hundred cards are on the Revenant Recon decklist page, and every other precon we cover is on the precon directory.
Mirko, Obsessive Theorist is a three-mana 1/3 with flying and vigilance. Whenever you surveil, it gets a +1/+1 counter. At the beginning of your end step, you may return a creature card with power less than Mirko's from your graveyard to the battlefield with a finality counter on it, which means it is exiled instead of dying the next time. Each creature comes back once, so the value is in creatures that do something when they enter.
Surveil is how both halves work. Surveil lets you look at the top cards of your library and put any of them into your graveyard, so it grows Mirko and stocks the graveyard with targets at the same time. Consider , Curate , Otherworldly Gaze , Sinister Starfish and Doom Whisperer all surveil, and Enhanced Surveillance lets you look at two more cards each time.
The payoffs are creatures that are worth returning. Ravenous Chupacabra and Baleful Strix have low power and strong effects on entering, so Mirko can bring them back early. Whispering Snitch and Dimir Spybug reward the surveiling itself, and Syr Konrad, the Grim deals damage to each opponent whenever a creature card leaves your graveyard.
Mirko, Obsessive Theorist ↗
Grows with every surveil and returns a creature with less power than it each end step, so a single cheap surveil spell can turn into a free creature.
Ravenous Chupacabra ↗
A 2/2 that destroys an opponent's creature when it enters. Mirko can bring it back as soon as Mirko has 3 power.
Baleful Strix ↗
Two mana, draws a card, and blocks almost anything with deathtouch. Its 1 power makes it one of the easiest creatures for Mirko to return.
Enhanced Surveillance ↗
Every surveil looks at two extra cards. The deck surveils so often that this finds reanimation targets and the cards you need much faster.
Doom Whisperer ↗
A five-mana 6/6 flier that surveils 2 for 2 life whenever you want, which grows Mirko as many times as you can afford.
Whispering Snitch ↗
Deals 1 damage to each opponent and gains you 1 life the first time you surveil each turn. Small, but it adds up over a long game.
Mirko starts as a 1/3 and the deck does nothing to keep it alive. Because its counters reset when it dies, one removal spell sets the whole engine back to the start, and the precon has no equipment, counterspell or phasing effect aimed at protecting it.
The top end is heavy and mostly misses the plan. Rise of the Dark Realms costs nine, Sphinx of the Second Sun costs eight, and Eye of Duskmantle and Watcher of Hours are big creatures that Mirko needs a lot of counters to return. The mana base adds to the problem with Temple of the False God , Drownyard Temple and Hostile Desert all tapping only for colorless.
Each upgrade below starts from something the deck does poorly and says what a replacement card has to do. The cards named are examples, not the only answer: if you own something else that does the same job, or a newer printing does it better, it goes in the same slot. Make one change at a time and play a few games between them, so you can tell which change helped. The general method is in how to upgrade a Commander precon →
Every counter on Mirko is one more point of power for the end-step return. Losing it to removal resets that to zero, and recasting it costs commander tax on top.
What to look for Cheap equipment or instants that give Mirko hexproof or remove it from harm for a turn. One that also adds a +1/+1 counter is a bonus.
Cut, for example
Foreboding Steamboat Exiles two creatures from every player, including yours, and only returns them to the graveyard one at a time as it attacks. It is slow and works against your own board.
Add, for example
Swiftfoot Boots ↗
Gives Mirko hexproof for an equip cost of one. Mirko's end-step ability targets a card in your graveyard, not Mirko, so hexproof doesn't get in the way.
Slip Out the Back ↗
One blue mana at instant speed: Mirko phases out until your next turn, dodging removal and board wipes, and keeps a new +1/+1 counter.
The deck's cheap surveil spells and its commander all need blue and black on the same early turns. Three colorless utility lands make that harder than it should be.
What to look for Lands that tap for blue or black and usually enter untapped.
Cut, for example
Temple of the False God Taps for nothing until you have five lands, so it is a blank in the turns you are trying to cast Mirko.
Drownyard Temple A colorless land whose only upside is coming back from the graveyard, which rarely matters.
Hostile Desert Taps for colorless and its creature ability exiles land cards from your graveyard. The deck has better uses for its mana.
Add, for example
Drowned Catacomb ↗
Enters untapped if you control an Island or a Swamp, which is almost always true, and taps for either color.
Underground River ↗
Always untapped. It taps for colorless for free or for blue or black at the cost of 1 damage.
Morphic Pool ↗
Enters untapped in any game with two or more opponents, so in Commander it is effectively an untapped dual.
Mirko gets better with each surveil, and the earliest turns matter most. Replacing the most expensive spells with cheap surveil effects grows Mirko faster.
What to look for Spells or permanents costing two or three mana that surveil, ideally every turn, or creatures with low power that dig through your library when they enter.
Cut, for example
Rise of the Dark Realms Nine mana to return every creature from every graveyard. It ends games when it resolves, but Mirko already returns a creature every turn for free.
Sphinx of the Second Sun Eight mana for an extra beginning phase each turn. Strong, but too expensive to cast and too high-powered for Mirko to return.
Mirko only returns creatures with less power than it has, and each one only once. The best targets have 1 to 3 power and a strong effect when they enter.
What to look for Creatures with 3 power or less whose enter-the-battlefield effect removes something, drains opponents or takes a permanent.
Cut, for example
Eye of Duskmantle Seven mana for a 3/8 that lets you cast surveilled cards for life. Interesting, but expensive, and it adds nothing when Mirko returns it.
Watcher of Hours A 6/6 that takes six turns on suspend or six mana to cast. Mirko needs 7 power before it can return it.
Add, for example
Gray Merchant of Asphodel ↗
A 2/4 that drains each opponent for your devotion to black when it enters. Casting it and then returning it with Mirko gets you two drains.
Agent of Treachery ↗
A 2/3 that steals any permanent when it enters. Surveil it into the graveyard and Mirko can put it onto the battlefield without paying seven mana.
Skinrender ↗
A 3/3 that puts three -1/-1 counters on a creature when it enters, so it doubles as removal each time it hits the battlefield.
The deck wins by grinding. Mirko, Obsessive Theorist returns a creature at the end of every turn, so removal like Ravenous Chupacabra and drains like Gray Merchant of Asphodel happen twice, and Syr Konrad, the Grim and Whispering Snitch chip away at every opponent as cards move in and out of the graveyard. Grave Titan and Massacre Wurm are the big finishers you cast from hand. The upgrades above mostly keep Mirko on the battlefield and make the early turns smoother.
A moderate pick for a player who likes graveyard decks and small decisions every turn. Each surveil asks which cards to keep on top and which to bin, and each end step asks which creature to return while it can only come back once. A player new to Commander can play it, but it rewards someone who already plans a turn or two ahead.
Checked against the printed decklist on October 10, 2026.
TurnZero HQ keeps a win rate per deck version, so you can change a few cards, play some games, and see the difference instead of guessing.
Create Free Account