the front side of Tameshi, Reality Architect
the back of a classic MtG card
the front side of Mind Over Matter
the back of a classic MtG card
the front side of Ancient Den
the back of a classic MtG card
the front side of Razortide Bridge
the back of a classic MtG card

Color Identity: W, U

Initial Card State

  1.  Razortide Bridge in hand.
  2.  All other permanents on the battlefield.

Steps

  1. Activate Ancient Den by tapping it, adding ({W} magic symbol)  .
  2. Activate Mind over Matter by discarding Razortide Bridge, untapping Ancient Den.
  3. Activate Ancient Den by tapping it, adding ({W} magic symbol)  .
  4. Activate Tameshi by paying ({W} magic symbol)   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 ({W} magic symbol)   and returning Razortide Bridge from the battlefield to your hand, returning Ancient Den from your graveyard to the battlefield.
  7. Repeat.

Results

  1. Infinite landfall triggers.
  2. Infinite mana permanents you control can produce.
  3. Infinite self-discard triggers.
  4. Infinite untap of permanents you control.

Metadata

  1. In 97 decks according to EDHREC.
footer