Colos Yearling is a common Creature — Goat Beast card from Urza's Destiny (UDS), collector number 79. Current market price: $0.14 (foil $2.11), TCGplayer market prices via Scryfall.
Mountainwalk (This creature can't be blocked as long as defending player controls a Mountain.) {R}: This creature gets +1/+0 until end of turn.