Mona Lisa, Ever Adaptable

three generic mana one green mana Legendary Creature — Lizard MutantPower and toughness4/4

Whenever a player casts a creature spell, you create a Mutagen token. (It's an artifact with " one generic mana , tap this permanent , Sacrifice this token: Put a +1/+1 counter on target creature. Activate only as a sorcery.")

"Being surrounded by a little chaos is normally my little happy place, but . . ."

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Mona Lisa, Ever Adaptable rulings

2026-01-27
Some spells and abilities that create Mutagen tokens require targets. If each target chosen is an illegal target as that spell or ability tries to resolve, it won't resolve. The Mutagen token won't be created.
2026-01-27
Mona Lisa's ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered or otherwise leaves the stack.
2026-01-27
Mutagen tokens are a kind of predefined token. Each one is a colorless artifact with the artifact subtype Mutagen and the ability ", , Sacrifice this token: Put a +1/+1 counter on target creature. Activate only as a sorcery."