Adapting Assailant

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 a +1/+1 counter: Target opponent reveals a card from his or her hand at random. If
a creature card is revealed this way, that player discards that card and you put a +1/+1 counter
on Adapting Assailant.