Thundering Spineback is a uncommon Creature — Dinosaur card from The Lost Caverns of Ixalan Commander (LCC), collector number 260. Current market price: $0.36, 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.)