Flameskull + Goldspan Dragon + Phantom Train + Prosper, Tome-Bound + Xorn
Flameskull
Creature — Skeleton
Goldspan Dragon
Creature — Dragon
Phantom Train
Artifact — Vehicle
Prosper, Tome-Bound
Legendary Creature — Tiefling Warlock
Xorn
Creature — Elemental
Result
- Infinite artifact ETB
- Infinite artifact LTB
- Infinite artifact sacrifice triggers
- Infinite artifact tokens
- Infinite creature LTB
- Infinite creature ETB
- Infinite colored mana
- Infinite creature sacrifice triggers
- Infinite death triggers
- Infinite storm count
- Exile your library
- Infinite Treasure tokens
- Infinite +1/+1 counters on a creature
Combo data from Commander Spellbook.