Mirari, Heart of Desire

At the beginning of each player's upkeep, if that player has the most life or tied for the most life, they gain control of Mirari, Heart of Desire
Whenever you cast an instant or sorcery spell, or activate an ability of a permanent you control, you may pay 5 life. If you do, copy that spell or ability. You may choose new targets for the copy.
Seer of desires, granter of wishes, sower of temptation, and architect of war.