Tikal, the elder one

: Devoid (this card has no color) If you sacrifice creatures to add mana to your mana pool, add twice that mana instead.
+2: You may sacrifice a creature. If you do, gain one life and draw one card. If you don't, scry 3
-3: The next creature spell you cast cost {2} less to cast. When you cast your next creature spell,copy it.