Hystrodon

Trample Whenever this creature deals combat damage to a player, you may draw a card. Morph {1}{G}{G} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6o5f062uw1pb1hmwwki821.