Bergald, Forest Crasher

Trample, Haste, Horsemanship (This creature
can't be blocked except by creatures with
horsemanship.)
Berserk (When this attacks, you may double its
power. If you do, sacrifice it at the beginning of your
end step.)
Ambush {2}{r}{g} (Whenever one or more creatures attacks you, if this card is in your hand, you may
play it as an instant for it's Ambush cost. If you do,
return it to your hand at end of combat.)