Ochre Jelly — Adventures in the Forgotten Realms #196

Trample

This creature enters with X +1/+1 counters on it.

Split — When this creature dies, if it had two or more +1/+1 counters on it, create a token that's a copy of it at the beginning of the next end step. The token enters with half that many +1/+1 counters on it, rounded down.