Sivid, Dark Channel Captain

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 Sivid, Dark Channel Captain attacks,
exile the top 3 cards of your library. You may
put any number of creature cards from among
them onto the battlefield if it has power equal to
or less than Sivid, Dark Channel Captain's power.