Null and Void, Dark Twins

When Null and Void enters, draw three cards, then put two cards from your hand on top of your library in any order.

When Null and Void dies, exile the top card of your library. Target opponent loses life equal to its mana value. If it’s an instant or sorcery card, you may cast it without paying its mana cost.

"A perfect balance of Rage and Sorrow, both born to kill..."