Tavern Brawler

酒馆斗殴客 (Tavern Brawler) (zhs)

Legendary Enchantment - Background (CMC 3)
Commander creatures you own have "At the beginning of your upkeep, exile the top card of your library. This creature gets +X/+0 until end of turn, where X is that card's mana value. You may play that card this turn."