Diana, Scorn of the Moon

Whenever Diana enters the battlefield, attacks,
blocks or becomes tapped, you may put the top
card of your library into your graveyard.
Ultimate — {r}{g}{w}{u}, {t}: Scry 4, then reveal
the top card of your library. If it has the same
name as another card in your graveyard, Diana
deals damage equal to that card's converted
mana cost to any target. Then, you gain that
much life and draw a card.