Urza, Prince of Kroog + Turnabout + Encroaching Mycosynth + Mnemonic Wall
How it works
- Activate all mana-producing lands you control by tapping them, adding at least 8.
- Cast Turnabout by paying 2, untapping all lands you control.
- Activate Urza by paying 6, creating a token copy of Mnemonic Wall that is a 1/1 Soldier in addition to its other types.
- When the Mnemonic Wall token enters the battlefield, it triggers, returning Turnabout to your hand from your graveyard.
- Repeat.
- If lands you control can tap to proudce at least 9, this combo nets infinite mana, which can be used to activate Urza's ability infinitely and/or cast Turnabout choosing its other modes.
This loop relies on transforming your entire board into artifacts via Encroaching Mycosynth, turning your utility creatures into legal targets for Urza, Prince of Kroog's token-copy ability. By paying six mana to copy Mnemonic Wall, the new token enters the battlefield and its trigger neatly fishes Turnabout back out of your graveyard. Since Encroaching Mycosynth also makes your lands artifacts, Turnabout can untap them as artifacts to pay for the next iteration. As long as your lands produce enough mana to cover the activation cost and the spell, you generate an infinite chain of entering Mnemonic Wall tokens that continuously rebuy and recast Turnabout, leaving you with infinite mana and an arbitrarily massive army of artifact creature tokens.