Mindslaver + Volrath's Dungeon

Mindslaver
Volrath's Dungeon

Requires
Mindslaver must be on the battlefield. Volrath's Dungeon must be in hand. The opponent after you in turn order has a life total that is divisible by 5. Mana needed: 6bb
Steps
  1. Cast Volrath's Dungeon for 2bb.
  2. Target the opponent who's turn is after yours with Mindslaver.
  3. On their turn, force them to pay 5 life to destroy Volrath's Dungeon while holding priority.
  4. With the destroy trigger on the stack, repeat this process until they have 0 life.
Results
Target player loses the game.