Strathmuk, Mad Alchemist

+2: Flip two coins, You lose 1 life for each tails, and target opponent loses 2 life for each heads.
-3: Flip a coin, if heads, put a +1/+1 counter on each creature you control. If tails, put a -1/-1 counter on each creature your opponent controls.
-7: Sacrifice all creatures you own. Put a 6/6 experiment token onto the battlefield with trample and flying for each creature sacrificed this way.