Experiment 19-C

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.)
Remove two +1/+1 counters from
Experiment 19-C: Create a 0/0 black germ
creature token. It enters the battlefield with
two +1/+1 counters on it.