Gate Smasher is a uncommon Artifact — Equipment card from Dragons of Tarkir (DTK), collector number 239. Current market price: $0.14 (foil $0.33), TCGplayer market prices via Scryfall.
This Equipment can be attached only to a creature with toughness 4 or greater. Equipped creature gets +3/+0 and has trample. Equip {3}