Activate Ashnod's Altar by sacrificing Grim Poppet.
When Grim Poppet dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it. This will be removed by its static ability, which will result in Grim Poppet having two -1/-1 counters instead.
Repeat.

Infinite -1/-1 counters

Infinite colorless mana

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Mikaeus, the Unhallowed

Grim Poppet

Ashnod's Altar

Activate Volrath by paying {1}, causing it to become a copy of Grim Poppet until your next turn.
Activate Grim Poppet by removing a -1/-1 counter from it, putting a -1/-1 counter on Volrath.
Hapatra triggers, creating a creature token.
Activate Volrath by removing a -1/-1 counter from it, putting a -1/-1 counter on Grim Poppet.
Hapatra triggers, creating a creature token.
Repeat from step 2.

Infinite creature tokens

Volrath, the Shapestealer

Hapatra, Vizier of Poisons

Activate Necrotic Ooze using Devoted Druid's first ability by tapping it, adding {G}.
Activate Necrotic Ooze using Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it.
Activate Necrotic Ooze using Grim Poppet's ability by removing a -1/-1 counter from it, targeting any other creature.
Holding priority, activate Necrotic Ooze using Devoted Druid's first ability by tapping it, adding {G}.
Repeat from step 2.

Infinite green mana

Necrotic Ooze

Devoted Druid

Activate Grim Poppet by removing a -1/-1 counter from it, targeting another creature.
Repeat until Grim Poppet has no -1/-1 counters on it.
Activate Antler Skulkin by paying {2}, giving Grim Poppet persist until end of turn.
Activate Ashnod's Altar by sacrificing Grim Poppet, adding {C}{C}.
Grim Poppet dies, triggering its persist ability, returning it from your graveyard to the battlefield with a total of four -1/-1 counters on it.
Repeat.

Elesh Norn, Grand Cenobite

Painter's Servant

Antler Skulkin

Activate Grim Poppet by removing a -1/-1 counter from it, targeting another creature.
Repeat until Grim Poppet has no -1/-1 counters on it.
Activate Antler Skulkin by paying {2}, giving Grim Poppet persist until end of turn.
Activate Krark-Clan Ironworks by sacrificing Grim Poppet, adding {C}{C}.
Grim Poppet dies, triggering its persist ability, returning it from your graveyard to the battlefield with a total of four -1/-1 counters on it.
Repeat.

Krark-Clan Ironworks

Activate Grim Poppet by removing a -1/-1 counter from it, putting a -1/-1 counter on Spark Double.
Nest of Scarabs triggers, creating a creature token.
Activate Spark Double by removing a -1/-1 counter from it, putting a -1/-1 counter on Grim Poppet.
Nest of Scarabs triggers, creating a creature token.
Repeat.

Spark Double

Nest of Scarabs

Crovax, Ascendant Hero

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 Blasting Station by tapping it and 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.
When Grim Poppet enters, Blasting Station triggers, untapping Blasting Station.
Resolve the Blasting Station ability from step 3.
Repeat.
Resolve all Grim Poppet abilities, putting infinite -1/-1 counters on any number of creatures.

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