Mutational Advantage is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
Permanents you control with counters on them gain hexproof and indestructible until end of turn. Prevent all damage that would be dealt to those permanents this turn. Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
Complete guide
Mutational Advantage is a powerful protection spell that rewards you for playing with counters of all types. It offers a shield of safety for your modified creatures while simultaneously growing your board state through the proliferate mechanic. Whether you are avoiding a board wipe or beefing up your army, this instant provides a massive swing in momentum.
What Mutational Advantage Does
Mutational Advantage identifies every permanent you control that currently has at least one counter on it. These permanents gain two of the most resilient keywords in the game: Hexproof and Indestructible. Additionally, it creates a 'shield' effect that prevents all damage that would be dealt to those specific permanents for the remainder of the turn. Finally, the spell allows you to Proliferate, adding extra counters to any players or permanents of your choice that already have them.
Step-by-Step Resolution
First, the game checks which permanents you control have counters as the spell resolves. These permanents are locked in; they gain the protective keywords and damage prevention immediately. Second, you perform the Proliferate action. You choose any number of permanents or players with counters and add one more of each kind of counter they already have. Note that the protection effect does not 'look back'—if you add a counter to a permanent during the Proliferate step that didn't have one before, it does not gain hexproof or indestructible.
Common Pitfalls
A common mistake is thinking the protection applies to permanents that receive counters later in the turn. Only permanents that have counters at the exact moment Mutational Advantage resolves are protected. Conversely, if a protected permanent loses all its counters later that turn, it stays protected because the effect was already applied. Also, remember that Proliferate is a choice; you can choose to Proliferate on an opponent's permanent if you want to increase something like a Poison counter, or choose nothing at all.
When to Play It
This card is best used as a response to removal or combat. Since it provides Indestructible and prevents damage, it is a perfect counter to 'damage-based' board clears or unfavorable blocks. Because it is an Instant, you can wait until the last possible moment to cast it, ensuring your key pieces are protected right when they are most vulnerable.
Interaction examples
Beast WithinSuppose your opponent casts Beast Within targeting your creature that has a +1/+1 counter. In response, you cast Mutational Advantage. Mutational Advantage resolves first, giving your creature Hexproof. When Beast Within tries to resolve, its target is now illegal, and it is removed from the stack with no effect; your creature survives and you don't even create a Beast token.
CounterspellIf you cast Mutational Advantage, your opponent has the chance to use Counterspell while it is on the stack. However, once the spell begins to resolve, no one can cast spells or activate abilities until you have finished protecting your permanents and completed the Proliferate process. Your opponent cannot wait to see which permanents you choose to Proliferate before deciding to counter the spell.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Mutational Advantage
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
The set of permanents affected by Mutational Advantage is determined at the time Mutational Advantage resolves. Permanents that gain counters later in the turn won’t become affected by this effect, and permanents that lose all of their counters later in the turn won’t stop being affected.
No other card is named in this ruling.
- #2· Wizards of the Coast
You can choose any permanent that has a counter, including ones controlled by opponents. You can choose any player who has a counter, including opponents. You can’t choose cards in any zone other than the battlefield, even if they have counters on them.
No other card is named in this ruling.
- #3· Wizards of the Coast
You don’t have to choose every permanent or player that has a counter—only the ones you want to add counters to. Since “any number” includes zero, you don’t have to choose any permanents at all, and you don’t have to choose any players at all.
No other card is named in this ruling.
- #4· Wizards of the Coast
If a player or permanent has more than one kind of counter on it, and you choose for it to get additional counters, it must get one of each kind of counter it already has. You can’t have it get just one kind of counter it already has and not the others.
No other card is named in this ruling.
- #5· Wizards of the Coast
Players can respond to a spell or ability whose effect includes proliferating. Once that spell or ability starts to resolve, however, and its controller chooses which permanents and players will get new counters, it’s too late for anyone to respond.
No other card is named in this ruling.
- #6· Wizards of the Coast
Some spells and abilities that cause you to proliferate may require targets. If each target chosen is an illegal target as that spell or ability tries to resolve, it won’t resolve. You won’t proliferate.
No other card is named in this ruling.
Legal formats
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Meta decks with Mutational Advantage
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