Urza, Prince of Kroog + Timestream Navigator + Mycosynth Lattice

Urza, Prince of Kroog

Timestream Navigator

Mycosynth Lattice

How it works

1. Activate Urza by paying 6, creating a token copy of Timestream Navigator that is a 1/1 Soldier creature.
2. Activate the oldest Timestream Navigator by paying 2, tapping it and putting it on the bottom of your library from the battlefield, causing you to take an extra turn after this one.
3. Repeat each turn.

By turning every permanent on the battlefield into an artifact, Mycosynth Lattice ensures that Urza, Prince of Kroog can target anything you control with his sixth ability—including Timestream Navigator itself. Once the Navigator has earned you the city's blessing, you can tap it to take an extra turn while shuffling it safely away. Urza then steps in to forge a fresh token copy of Timestream Navigator for six mana, letting you repeat the loop every single turn to lock down the game.