Prerequisites
- Vision, Spectral Synthezoid on the battlefield
- Multiversal Incursion in hand
- Timeless Witness on the battlefield
Steps
- Cast Multiversal Incursion for free due to Vision, creating a nonlegendary token copy of each nontoken creature you control
- When the Timeless Witness token enters, it triggers, returning Multiversal Incursion from your graveyard to your hand
- Repeat
Results
- Infinite artifact ETB
- Infinite artifact tokens
- Infinite copies of creatures you control
- Infinite creature ETB
- Infinite creature tokens
- Infinite magecraft triggers
- Infinite storm count
Required Cards 3

Vision, Spectral Synthezoid
Legendary Artifact Creature — Robot Hero

Multiversal Incursion
Sorcery

Timeless Witness
Creature — Human Shaman