Thran War Machine is a uncommon Artifact Creature — Construct card from Urza's Legacy (ULG), collector number 134. Current market price: $0.14 (foil $0.46), TCGplayer market prices via Scryfall.
Echo {4} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.) This creature attacks each combat if able.