Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Grim Poppet + Altar of Dementia
Infinite LTB, Infinite ETB, Infinite sacrifice triggers, Infinite death triggers, Infinite mill, Infinite self-mill, Destroy each creature that enters the battlefield under an opponent's control, Destroy any number of creatures, Infinite -1/-1 counters, Lock
If Grim Poppet has any -1/-1 counters on it, activate it by removing a -1/-1 counter from it.
Repeat step 1 as necessary until Grim Poppet has no -1/-1 counters on it.
Activate Altar of Dementia by sacrificing Grim Poppet.
When Grim Poppet dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
Resolve the Altar of Dementia ability.
Repeat.
Resolve all Grim Poppet abilities, putting infinite -1/-1 counters on any number of creatures.
Component Cards
How It Works
If Grim Poppet has any -1/-1 counters on it, activate it by removing a -1/-1 counter from it.
Repeat step 1 as necessary until Grim Poppet has no -1/-1 counters on it.
Activate Altar of Dementia by sacrificing Grim Poppet.
When Grim Poppet dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
Resolve the Altar of Dementia ability.
Repeat.
Resolve all Grim Poppet abilities, putting infinite -1/-1 counters on any number of creatures.