Soluble Ooze

Submerge (When this creature enters the battlefield, you may put a -1/-1 counter on it. If
you do, it becomes submerged and it can't be blocked.)
As long as Soluble Ooze is submerged, it has backup X where X is its power. (When this creature dies, create X 1/1 creature tokens that share all types and colors with it.)