Choose target creature. Reveal cards from the top of your library until you reveal a nonland card. That creature gets +X/-X until end of turn, where X is that card's mana value. Put all cards revealed this way on the bottom of your library in any order.
Mana cost
2
U
Mana value
3
Printings
From
$0.05
EDHREC rank
#29465
Buy
Formats
Modern
Legal
Legacy
Legal
Vintage
Legal
Commander
Legal
Pauper
Legal
Rulings
19 Mar 2021
If a card in a player's library has {X} in its mana cost, X is considered to be 0.
19 Mar 2021
You reveal cards and the creature gets +X/-X all while Erratic Mutation is resolving. Nothing can happen in between, and no player can take actions.