Usually, the REG has handy Play As for this situation:
Sleep (UL)
Type: Hero Enh. • Brigade: White • Ability: None • Class: None • Special Ability: Set Hero aside. Hero gains 1/1 for every turn Hero sleeps. Discard after Hero awakes. • Play As: Set aside Hero. Increase Hero 1/1 for every turn Hero is set aside. • Identifiers: OT, Involves Music • Verse: Psalms 3:5 • Availability: Unlimited booster packs (Rare)