Tadhiel, The Tithe of War

Flying, vigilance, haste
Whenever Tadhiel, The Tithe of War or another
creature you control deals combat damage to an
opponent, create a Treasure token.
Sacrifice 15 Treasure tokens: Untap all other
creatures you control. After this main phase,
there is an additional combat phase followed
by an additional main phase. Activate this ability
only as a sorcery.