Nicol Bolas, Hellbringer

: When you cast this planeswalker, you can sacrifice any number of permanents. For each permanent you sacrifice, add 4 colourless mana.
+5: Lose 5 life and draw 5 cards.
-10: Search your library for 5 cards and cast them without paying their mana cost. Lose life equal to their mana cost combined +5.