Wiitigo

This creature enters with six +1/+1 counters on it. At the beginning of your upkeep, put a +1/+1 counter on this creature if it has blocked or been blocked since your last upkeep. Otherwise, remove a +1/+1 counter from it.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6oi8zsd56jpb1hw8qr7m85.