Unstable Amulet

When Unstable Amulet enters, you get {e}{e} (two energy counters).

Whenever you cast a spell from anywhere other than your hand, Unstable Amulet deals 1 damage to each opponent.

{t}, Pay {e}{e}: Exile the top card of your library.
You may play it until you exile another card with Unstable Amulet.