Evernight Shade dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
Resolve the
Viscera Seer ability.
Activate
Viscera Seer by sacrificing
Evernight Shade.
When
Evernight Shade dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
Evernight Shade enters and dies as a state-based action due to having 0 toughness. Its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
Resolve the
Viscera Seer ability from step 4.
Repeat from step 4.
Notes
If
Evernight Shade starts with a +1/+1 counter on it, then you may start the combo from step 4 instead.
Results
Infinite creature ETB.
Infinite creature LTB.
Infinite death triggers.
Infinite creature sacrifice triggers.
Infinite scry 1.
Metadata
Bracket tag
ExhibitionBracket 1+
For any deck
1
2
3
4
5
1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.