Rakdos the Defiler (GK2) from RNA Guild Kit, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Zoltan Boros & Gabor Szikszai
• Card Text:
  Flying, trample
  Whenever Rakdos the Defiler attacks, sacrifice half the non-Demon permanents you control, rounded up.
  Whenever Rakdos deals combat damage to a player, that player sacrifices half the non-Demon permanents they control, rounded up.