Lethal Scheme (TDC) from Tarkir: Dragonstorm Commander, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Tuan Duong Chu
• Card Text:
  Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for 1 or one mana of that creature's color.)
  Destroy target creature or planeswalker. Each creature that convoked this spell connives. (Draw a card, then discard a card. If you discarded a nonland card, put a +1/+1 counter on that creature.)