Blizzard Elemental

The untap ability is the whole pitch, and it solves a problem most flying beaters never address: vulnerability while attacking. Pay , and the 5/5 flier taps for the swing then untaps to block on the crackback, blanking the ground rush an evasive attacker normally leaves itself open to. It reads like a mana sink, but the function is a permanent vigilance toggle bought one combat step at a time, which is a more flexible deal than a printed keyword: you spend only when the defensive turn actually arrives. The cost structure is the design discipline holding it in check. Seven mana for the body, plus four more every time you want both ends of the combat, means the engine only comes online when the game has gone long, and by then the untap is competing with whatever else a control deck wants its mana doing. That tension is the point. A high-end blue finisher that asks you to weigh tempo against survivability turn by turn rather than committing to one mode at deckbuilding time, it wins the air on offense and refuses to surrender it on defense, provided you can keep feeding the activation.