Theurgic Trickster

Extort (Whenever you cast a spell, you may pay {w/b}. If you do, each opponent loses 1 life and you gain that much life.)
When Theurgic Trickster enters the battlefield, you may discard a card and pay 2 life. If you do, search your library for a card with converted mana cost 4 or less and put it into your hand. Then shuffle your library.