Hallec Highmoon

Partner with Ratori Cauge(When this creature
enters the battlefield, target player may put Ratori into
their hand from their library, then shuffle.)
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 creatures your team controls attack the player with the most health, those creatures have menace.