Barren Scavenger

{1}{g}: When this creature enters the battlefield this turn, put a +1/+1 counter on it. Activate this ability only while this spell is on the stack.
Splice onto Beast - Exile two creature cards from your graveyard. (As you cast a Beast spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)