Thundering Spineback is a uncommon Creature — Dinosaur card from Jumpstart (JMP), collector number 437. Current market price: $0.29, TCGplayer market prices via Scryfall.
Other Dinosaurs you control get +1/+1. {5}{G}: Create a 3/3 green Dinosaur creature token with trample. (It can deal excess combat damage to the player or planeswalker it's attacking.)