We Hope You Like Squirrels

At the beginning of each player's upkeep and whenever a player casts a spell, that player creates a 1/1 green Squirrel creature token. Whenever chaos ensues, put a +1/+1 counter on each Squirrel you control.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6oe8i9a2ujpb1h66ko90et.