Adventures in the Forgotten Realms
Creature — Ooze
Ochre Jelly enters the battlefield with X +1/+1 counters on it.
Split — When Ochre Jelly 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. That token enters the battlefield with half that many +1/+1 counters on it, rounded down.