Titanoth Rex is a uncommon Creature — Dinosaur Beast card from Ikoria: Lair of Behemoths (IKO), collector number 174. Current market price: $0.37 (foil $3.78), TCGplayer market prices via Scryfall.
Trample Cycling {1}{G} ({1}{G}, Discard this card: Draw a card.) When you cycle this card, put a trample counter on target creature you control.