Initial Card State
- All permanents on the battlefield (Eirdu as Isilu, Carrier of Twilight and Young Wolf without a +1/+1 counter on it).
Steps
- Activate Phantom Train by sacrificing Young Wolf.
- When Young Wolf dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
- Resolve the Phantom Train ability.
- Activate Phantom Train by sacrificing Young Wolf.
- When Young Wolf dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
- Young Wolf 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 Phantom Train ability from step 4.
- Repeat from step 4.
Notes
- If Young Wolf starts with a +1/+1 counter on it, then you may start the combo from step 4 instead.
Results
- Infinite +1/+1 counters on a creature.
- Infinite ETB.
- Infinite LTB.
- Infinite death triggers.
- Infinite sacrifice triggers.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).