When this creature enters, create a Mutagen token. (It's an artifact with ", , Sacrifice this token: Put a +1/+1 counter on target creature. Activate only as a sorcery.")
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"The Slithery! He's snatches little kids an' keeps 'em in cages! He don't got no legs and just slithers."
—Lita
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 · Wizards of the Coast
Mutagen tokens are a kind of predefined token. Each one is a colorless artifact with the artifact subtype Mutagen and the ability "{1}, {T}, Sacrifice this token: Put a +1/+1 counter on target creature. Activate only as a sorcery."
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, Sacrifice this token: Put a +1/+1 counter on target creature. Activate only as a sorcery.")
Invasion
