Giroth, Havoc's Harbinger

+2: Flip a coin. If heads, discard a card then draw a card. If tails, discard a card and target opponent loses life equal to its converted mana cost.
-2: Each opponent discards a card. Put a -1/-1 counter on target creature or Planeswalker for each card discarded this way.
-5: Create X 5/5 black Demon creature token with flying for each -1/-1 counter in play. If Giroth, Havoc's Harbinger died, double the value for X.