Requires

Ashnod the Uncaring must be on the battlefield. Bolas's Citadel must be on the battlefield. Manifold Key must be on the battlefield. Each opponent's life total is no greater than 40. You control at least 18 other nonland permanents. Mana needed:

Steps

1. Activate Bolas's Citadel by tapping it and sacrificing ten other nonland permanents you control.
2. Ashnod the Uncaring triggers, copying Bolas's Citadel's ability.
3. Resolve both Bolas's Citadel abilities, causing each opponent to lose 20 life.
4. Each opponent that had 20 or less life loses the game due to having 0 or less life.
5. Activate Manifold Key's first ability by paying and tapping it, untapping Bolas's Citadel.
6. Activate Bolas's Citadel by tapping it and sacrificing itself, Manifold Key, and eight other nonland permanents you control.
7. Ashnod the Uncaring triggers, copying Bolas's Citadel's ability.
8. Resolve both Bolas's Citadel abilities, causing each opponent to lose 20 life.
9. Each remaining opponent loses the game due to having 0 or less life.

Results