Effects that Alter a Creature's Power/Toughness (Anthem Effects)
Initial Card State
All permanents on the battlefield (
Eirdu as Isilu, Carrier of Twilight).
Steps
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
Grinding 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,
Grinding Station triggers, untapping
Grinding Station.
Resolve the
Grinding Station ability from step 3.
Repeat.
Resolve all
Grim Poppet abilities, putting infinite -1/-1 counters on any number of creatures.
Notes
The chosen anthem effect must boost toughness by at least 1 to prevent
Grim Poppet from dying due to the -1/-1 counters. You can perform this combo as a lock whenever a creature enters the battlefield to put -1/-1 counters on that creature and cause it to die.
Results
Infinite LTB.
Infinite ETB.
Infinite sacrifice triggers.
Infinite death triggers.
Infinite mill.
Infinite self-mill.
Destroy all creatures that enter the battlefield under an opponent's control.