Initial Card State
- All permanents on the battlefield (Eirdu as Isilu, Carrier of Twilight and Witch-king without a +1/+1 counter on it).
Steps
- Activate Phyrexian Altar by sacrificing Witch-king.
- When Witch-king dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
- Activate Phyrexian Altar by sacrificing Witch-king.
- When Witch-king dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
- Repeat.
Notes
- If Witch-king starts with a +1/+1 counter on it, then you may start the combo from step 3 instead.
Results
- Infinite ETB.
- Infinite LTB.
- Infinite colored mana.
- Infinite death triggers.
- Infinite sacrifice triggers.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).