Phantom Train + Su-Chi Cave Guard + Urza, Prince of Kroog
Phantom Train
Artifact — Vehicle
Su-Chi Cave Guard
Artifact Creature — Construct
Urza, Prince of Kroog
Legendary Creature — Human Artificer
Result
- Infinite artifact ETB
- Infinite artifact LTB
- Infinite artifact sacrifice triggers
- Infinite +1/+1 counters on a creature
- Infinite creature ETB
- Infinite creature LTB
- Infinite colorless mana
- Infinite creature copies of artifacts you control
- Infinite creature tokens
- Infinite death triggers
- Infinite creature sacrifice triggers
Combo data from Commander Spellbook.