At the beginning of your combat phase, Helm of the Host triggers, creating a nonlegendary token copy of Ghyrson Starn with haste.
Deal exactly two or three damage to a permanent or player, which is reduced to one due to Ghosts of the Innocent.
Ghyrson Starn and the Ghyrson Starn token each trigger.
Resolve the Ghyrson Starn trigger, dealing 1 damage to that permanent or player due to Ghosts of the Innocent.
The Ghyrson Starn token triggers, dealing 1 damage to that permanent or player due to Ghosts of the Innocent.
Ghyrson Starn triggers, dealing 1 damage to that permanent or player due to Ghosts of the Innocent.
 Repeat from step 5.

Infinite damage to any target

Ghyrson Starn, Kelermorph

Helm of the Host

Ghosts of the Innocent

Cast Irenicus's Vile Duplication by paying {3}{U}, creating a nonlegendary token copy of Ghyrson Starn.
Deal exactly two or three damage to a permanent or player, which is reduced to one due to Ghosts of the Innocent.
Ghyrson Starn and the Ghyrson Starn token each trigger.
Resolve the Ghyrson Starn trigger, dealing 1 damage to that permanent or player due to Ghosts of the Innocent.
The Ghyrson Starn token triggers, dealing 1 damage to that permanent or player due to Ghosts of the Innocent.
Ghyrson Starn triggers, dealing 1 damage to that permanent or player due to Ghosts of the Innocent.
 Repeat from step 5.

Combos with "Ghosts of the Innocent"