Sett

Legend · PassiveIf a buffed unit you control would die, you may pay [C], exhaust me, and spend its buff to heal it, exhaust it, and recall it instead. When you conquer, ready me.

Sett fights on buffs. Brawler cashes his in for +4 and earns it back by conquering, and The Boss spends a buff to drag a dying unit home instead — his trials teach you when to spend, when to sacrifice, and how to make the save pay.