Ghyrson Starn, Kelermorph, Gisela, Blade of Goldnight, Helm of the Host, and Blim, Comedic Genius

Prerequisites

• Ghyrson Starn, Kelermorph on the battlefield
• Gisela, Blade of Goldnight on the battlefield
• Helm of the Host on the battlefield
• Blim, Comedic Genius on the battlefield
• You have a way to deal exactly two or three damage to an opponent
• Helm of the Host attached to Ghyrson Starn
• Blim does not have summoning sickness and cannot be blocked by an opponent

Steps

1. At the beginning of your combat phase, Helm of the Host triggers, creating a token copy of Ghyrson Starn that isn't legendary
2. Deal combat damage to an opponent using Blim
3. Blim triggers, giving an opponent control of Gisela
4. Deal 2 damage to that opponent by any method, reduced to 1 due to Gisela
5. Ghyrson Starn and the Ghyrson Starn token trigger
6. Resolve the nontoken Ghyrson Starn trigger, dealing 1 damage to the opponent
7. The token Ghyrson Starn triggers, dealing 1 damage to the opponent
8. The nontoken Ghyrson Starn triggers, dealing 1 damage to the opponent
9. Repeat from step 7

Results

• Infinite damage to target opponent