Gate Colossus is a uncommon Artifact Creature — Construct card from Ravnica Remastered (RVR), collector number 257. Current market price: $0.14 (foil $0.34), TCGplayer market prices via Scryfall.
Affinity for Gates (This spell costs {1} less to cast for each Gate you control.) This creature can't be blocked by creatures with power 2 or less. Whenever a Gate you control enters, you may put this card from your graveyard on top of your library.