Riftbound Battlefield: Altar of Blood. If a unit here would die during combat, its controller may pay [A][A][A] to heal it, exhaust it, and recall it instead.
Riftbound Spell: Riposte. [Reaction] (Play any time, even before spells and abilities resolve.) Choose a friendly unit and a spell. Counter that spell and give that unit +[S] equal to that spell's Energy cost this turn.
Riftbound Spell: Back to Back. [Reaction] (Play any time, even before spells and abilities resolve.) Give two friendly units each +2 [S] this turn.