standard
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Rulings
If either target becomes illegal (say, if a creature’s power has changed such that the creature you control now has less power than the other creature), then the exchange won’t happen.
Rulings
If either target becomes illegal (say, if a creature’s power has changed such that the creature you control now has less power than the other creature), then the exchange won’t happen.
Your collection? Your decks?
Want to manage your collection and/or create decks?