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

Urza, Prince of Kroog

Reset

Liquimetal Coating

Mnemonic Wall

How it works

1. During an opponent's turn, after their upkeep step, 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 6.
3. Cast Reset by paying , 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 Reset to your hand from your graveyard.
6. Repeat from step 2.
7. If lands you control can tap to proudce at least 7, this combo nets infinite mana, which can be used to activate Urza's ability infinitely and/or cast Reset choosing its other modes.

This intricate loop relies on turning your utility pieces into clones to recur your entire hand at instant speed. By using Liquimetal Coating on Mnemonic Wall, you turn the Wall into an artifact so Urza, Prince of Kroog can copy it for six mana. When that Mnemonic Wall token enters the battlefield, its trigger lets you buy back Reset from your graveyard. Because you cast Reset on an opponent's turn after their upkeep, it untaps all your lands to pay for the next activation, generating infinite mana and an army of massive, buffed artifact creatures in the process.