Captain Sisay, Mind Over Matter, and Ulamog, the Infinite Gyre

Prerequisites

• Captain Sisay on the battlefield
• Mind Over Matter on the battlefield
• Ulamog, the Infinite Gyre in the library
• Captain Sisay does not have summoning sickness

Steps

1. Activate Captain Sisay by tapping it, searching your library for Ulamog and putting it into your hand
2. Activate Mind over Matter by discarding Ulamog, targeting Captain Sisay
3. Ulamog triggers, shuffling your graveyard into your library
4. Resolve the Mind over Matter ability, untapping Captain Sisay
5. Repeat

Results

• Infinite self-discard triggers