Ashnod the Uncaring + Bolas's Citadel + Galvanic Key

Prerequisites

• Each opponent's life total is no greater than 40.
• You control at least 18 other nonland permanents.

Steps

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

Effects

• Each opponent loses the game
• Near-infinite damage