Emberclaw Berserker

Flying, trample, haste
Whenever a creature you control deals combat damage,
reveal that many cards from the top of your library.
You may put a creature or land card with equal or lesser
mana value than the number of cards revealed this way
from among them onto the battlefield. Put the rest on
the bottom of your library in a random order.
When trees bow and skies glow red, beware the dragon
that rears it's head.