Scourge of the Throne

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 or tied for the most life, untap all attacking creatures. After this phase, there is an additional combat phase.