Scourge of the Throne [The Lord of the Rings: Tales of Middle-Earth Commander]

Flying
Dethrone (Whenever this creature attacks the player with the most life or tied for the most life, put a +1/+1 counter on it.)

Whenever Scourge of the Throne attacks for the first time each turn, if it's attacking the player with the most life, untap all attacking creatures. After this phase, there is an additional combat phase.