Urza, Prince of Kroog + Turnabout + Liquimetal Coating + Mnemonic Wall

Urza, Prince of Kroog

Turnabout

Liquimetal Coating

Mnemonic Wall

How it works

1. Activate Liquimetal Coating by tapping it, causing Mnemonic Wall to become an artifact until end of turn.
2. Activate all mana-producing lands you control by tapping them, adding at least 8.
3. Cast Turnabout by paying 2, untapping all lands you control.
4. Activate Urza by paying 6, creating a token copy of Mnemonic Wall that is a 1/1 Soldier in addition to its other types.
5. When the Mnemonic Wall token enters the battlefield, it triggers, returning Turnabout to your hand from your graveyard.
6. Repeat from step 2.
7. 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.

By using Liquimetal Coating to turn Mnemonic Wall into an artifact, you open the door for Urza, Prince of Kroog to forge an army of mechanical replicas. Each time the Mnemonic Wall token enters the battlefield, its triggered ability loops Turnabout back into your hand, while Turnabout’s untap mode refreshes your mana sources to pay for Urza, Prince of Kroog's ability and keep the cycle spinning. As long as your lands can produce enough mana to sustain the loop, this engine easily generates infinite mana alongside an endless legion of 1/1 Soldier artifact creature tokens buffed by Urza, Prince of Kroog's static anthem.