Unstable Amulet (Retro) [Modern Horizons 3]

When Unstable Amulet enters the battlefield, you get EE (two energy counters).
Whenever you cast a spell from anywhere other than your hand, Unstable Amulet deals 1 damage to each opponent.
T, Pay EE: Exile the top card of your library. You may play it until you exile another card with Unstable Amulet.