Thallid Behemoth

Decompose 7 (This creature enters the battlefield with 7 +1/+1 counters on it. At the beginning of your upkeep, remove a +1/+1 counter from it.)
Whenever a +1/+1 counter is removed from a creature you control, you may pay {1}. If you do, create a 1/1 green Saproling creature token.