Simic Chameleon

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.)
Graft 2 (This creature enters the battlefield
with 2 +1/+1 counters on it.Whenever
another creature enters the battlefield, you
may move a +1/+1 counter from this
creature onto it.)