Agumon

Digivolve {1} (You may reveal this card in your hand and target a Digital creature you control. Cast this card for its mana cost plus {1}, the target’s mana value may be spent as mana towards this cost. Place this card on top of the target, it has all abilities of the cards under it in addition to its own.) When this creature enters or digivolves, it deals damage equal to its power to any target.