Timestream Navigator + Molten Echoes + Riptide Laboratory

Timestream Navigator

Molten Echoes

Riptide Laboratory

How it works

1. Cast Timestream Navigator by paying 1.
2. If you don't have the city's blessing and control ten or more permanents, Timestream Navigator gives you the city's blessing.
3. When Timestream Navigator enters the battlefield, Molten Echoes triggers, creating a token copy of Timestream Navigator with haste.
4. If you don't have the city's blessing, the Timestream Navigator token gives you the city's blessing.
5. Activate Riptide Laboratory's second ability by paying 1 and tapping it, returning the nontoken Timestream Navigator to your hand from the battlefield.
6. Activate the Timestream Navigator token 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.
7. Repeat each turn.

This ingenious loop relies on a brilliant bit of token-cloning math to bend time itself in your favor. With Molten Echoes pre-set to the Wizard creature type, casting Timestream Navigator brings a fresh copy straight to the battlefield alongside the original, while Riptide Laboratory safely bounces the nontoken original back to your hand for reuse. Meanwhile, the token copy uses its own activation to shuffle itself away for an extra turn, completely circumventing its exile clause because it ends up safely on the bottom of your library instead. As long as you have the city's blessing active from your ten permanents, you can repeat this sequence every turn to completely lock down the game.