Savage Stomp is a uncommon Sorcery card from Jumpstart (JMP), collector number 427. Current market price: $0.26, TCGplayer market prices via Scryfall.
This spell costs {2} less to cast if it targets a Dinosaur you control. Put a +1/+1 counter on target creature you control. Then that creature fights target creature you don't control. (Each deals damage equal to its power to the other.)