Does the damage on a unit from Challenge units fighting each other stick around?
Yes, the damage dealt by Challenge persists on the units involved until it is removed.
According to RiftJudge FAQ 7781, damage from Challenge remains on units until either combat occurs on any battlefield (which triggers a Combat Cleanup) or the turn ends.
Key points to remember:
- Healing: Units do not heal immediately after using Challenge because Challenge is not considered combat (RiftJudge FAQ 7008).
- Persistence: The damage persists on the units even if they do not participate in any subsequent combat during the turn.
- Combat Cleanup: If combat happens on any battlefield, damage is removed from all units on the board during the resulting Combat Cleanup, regardless of whether those specific units were involved in the combat (RiftJudge FAQ 4225).
- End of Turn: Any remaining damage on units is cleared at the end of the turn (Rule 143.3.b.1).