Simic Biomancer

Evolve (Whenever a creature enters the battlefield
under your control, if that creature has greater
power or toughness than this creature, put a +1/+1
counter on this creature.)
Whenever one or more +1/+1 counters are put
on Simic Biomancer, you may remove all +1/+1
counters from it. If you do, create that many 0/0
green Ooze creature tokens, then distribute that
many +1/+1 counters among them.