Mutagen Man, Living Ooze

• WWizards of the Coast2026-01-27
  Official Ruling
  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."
• WWizards of the Coast2026-01-27
  Official Ruling
  Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keyword abilities are activated abilities and will have colons in their reminder text.
• WWizards of the Coast2026-01-27
  Official Ruling
  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.
• WWizards of the Coast2026-01-27
  Official Ruling
  Mutagen Man's second ability can cause the mana component of the cost to activate an ability of an artifact token to be .

Rulings via Scryfall