Kill Ondu Spiritdancer.
Myrkul triggers, creating a token copy of Ondu Spiritdancer that is an enchantment.
When the token Ondu Spiridancer enters the battlefield, it and Grim Guardian trigger.
Resolve the Grim Guardian trigger, causing each opponent to lose 1 life.
Resolve the Ondu Spiritdancer trigger, creating a token copy of itself.
Repeat from step 3.

Infinite lifeloss

Infinite copies of a specific creature

Myrkul, Lord of Bones

Ondu Spiritdancer

Grim Guardian

Activate Grimgrin by sacrificing Glen Elendra Guardian.
When Glen Elendra Guardian dies, its undying ability triggers, returning it from your graveyard to the battlefield without a +1/+1 counter on it due to its replacement effect.
Resolve the Grimgrin ability
Repeat.

Infinite +1/+1 counters on a creature

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Infinite death triggers

Mikaeus, the Unhallowed

Grimgrin, Corpse-Born

Glen Elendra Guardian

Cast Felidar Guardian by paying {3}{W}.
When Felidar Guardian enters the battlefield, it triggers, targeting Vesperlark.
Holding priority, activate Grimgrin by sacrificing Felidar Guardian.
Resolve the Felidar Guardian trigger, blinking Vesperlark.
When Vesperlark leaves the battlefield, it triggers, returning Felidar Guardian from your graveyard to the battlefield.
Repeat from step 2.

Felidar Guardian

Vesperlark

Activate Grimgrin by sacrificing another modified creature.
When the creature dies, Guardian of the Forgotten triggers, manifesting the top card of your library.
When the manifested card enters the battlefield, Gylwain triggers, creating a Role token attached to the manifested creature.
Resolve the Grimgrin ability.
Repeat.

Infinite self-mill

Near-infinite +1/+1 counters on a creature

Near-infinite creature ETB

Near-infinite creature LTB

Near-infinite creature sacrifice triggers

Near-infinite death triggers

Gylwain, Casting Director

Guardian of the Forgotten

Activate Grimgrin by sacrificing Priest of Gix.
When Priest of Gix dies, Rakdos triggers.
Holding priority, activate Haunted Crossroads by paying {B}, putting Priest of Gix from your graveyard onto the top of your library.
Resolve the Rakdos trigger, causing you to exile the top three cards of your library with the ability to play them until your next end step.
Resolve the Grimgrin ability from step 1.
Cast Priest of Gix from exile by paying at most {2}.
When Priest of Gix enters the battlefield, it triggers, adding {B}{B}{B}.
Repeat.

Exile your library with the ability to play the exiled cards until your next end step

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