Thran War Machine - Urza's Legacy (Uncommon) [ULG-134]

Thran War Machine is a 4/5 Artifact Creature from Urza's Legacy that features the echo ability, which requires you to pay its mana cost again at the beginning of your upkeep or sacrifice it. With a solid body and the stipulation to attack each combat, it can pressure opponents while fitting well in aggressive or artefact-centric decks. However, the echo cost can be a drawback if you can't maintain the mana, so careful planning is needed to maximise its impact.