Sorianos, Master of Blood

+1: You may discard a card. If you do, target opponent loses 3 life and you gain 3 life.
-1: Put a -1/-1 counter on taget creature. You gain 1 life.
-7: Look at the top 10 cards of your library. You may cast up to 4 spells among them without paying their mana costs. You lose 4 life.