Tameshi, Reality Architect, Mind Over Matter, Ancient Den, and Razortide Bridge

Prerequisites

• Tameshi, Reality Architect on the battlefield
• Mind Over Matter on the battlefield
• Ancient Den on the battlefield
• Razortide Bridge in hand

Steps

1. Activate Ancient Den by tapping it, adding
2. Activate Mind over Matter by discarding Razortide Bridge, untapping Ancient Den
3. Activate Ancient Den by tapping it, adding
4. Activate Tameshi by paying and returning Ancient Den from the battlefield to your hand, returning Razortide Bridge from your graveyard to the battlefield
5. Activate Mind over Matter by discarding Ancient Den, untapping any applicable permanent
6. Activate Tameshi by paying and returning Razortide Bridge from the battlefield to your hand, returning Ancient Den from your graveyard to the battlefield
7. Repeat

Results

• Infinite landfall triggers
• Infinite mana permanents you control can produce
• Infinite self-discard triggers
• Infinite untap of permanents you control