Amzu, Swarm's Hunger — Ravnica: Clue Edition #24

Flying, menace

Other Insects you control have menace.

Whenever one or more cards leave your graveyard, you may create a 1/1 black and green Insect creature token, then put a number of +1/+1 counters on it equal to the greatest mana value among those cards. Do this only once each turn.