Riftbound Spell: Tactical Retreat. [Reaction] (Play any time, even before spells and abilities resolve.) Choose a friendly unit. The next time it would die this turn, heal it, exhaust it, and recall it instead. (Send it to base. This isn't a move.)
Riftbound Spell: Retreat. [Reaction] (Play any time, even before spells and abilities resolve.) Return a friendly unit to its owner's hand. Its owner channels 1 rune exhausted.