Mikaeus, the Unhallowed + Soulstinger + Woe Strider

Mikaeus, the Unhallowed
Soulstinger
Woe Strider

Requires
Mikaeus, the Unhallowed must be on the battlefield. Soulstinger must be on the battlefield. Woe Strider must be on the battlefield. Soulstinger does not have a +1/+1 counter on it.
Steps
  1. Activate Woe Strider by sacrificing Soulstinger.
  2. When Soulstinger dies, its second and undying abilities trigger.
  3. Resolve the first trigger, allowing you to put a number of -1/-1 counters on a creature equal to the number that were on Soulstinger.
  4. Resolve the undying trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  5. When Soulstinger enters the battlefield, its first ability triggers, putting two -1/-1 counters on it.
  6. Resolve the Woe Strider ability, causing you to scry 1.
  7. Repeat.
Results
Infinite -1/-1 counters. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers. Infinite scry 1.

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