Croactl, Insatiable Vermin

Menace
Graft 3 (This creature enters the battlefield with three +1/+1 counters on it. Whenever another creature enters the battlefield, you may move a +1/+1 counter from this creature onto it).
Whenever one or more +1/+1 counters are
put on another creature you control, put
two +1/+1 counters on Croatl, Insatiable
Vermin.