Riftbound Unit: Karthus, Eternal. Your [Deathknell] effects trigger an additional time.
Riftbound Unit: Darius, Executioner. [Legion] — When you play me, ready me. (Get the effect if you've played another card this turn) Other friendly units have +1 [S] here.
Riftbound Legend: Voidreaver. When you win a combat, gain 1 XP. Spend 1 XP, [T]: [Buff] a unit. Spend 2 XP, [T]: Move an exhausted friendly unit from a battlefield to its base.