Allosaurus

Haste, empower
Whenever Allosaurus enters the battlefield or
attacks, you may exile target card from a
graveyard. If a creature card is exiled this way,
put a number of +1/+1 counters equal to that
creature's power on target creature you control.
If a noncreature card is exiled this way, add mana
of any color to your mana pool equal to the
exiled card's converted mana cost.