Timestream Navigator + Squee, the Immortal + Fiend Artisan

Timestream Navigator

Squee, the Immortal

Fiend Artisan

How it works

1. Activate 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.
2. Activate Fiend Artisan by paying 2B/G and sacrificing Squee, causing you to search your library for Timestream Navigator and put it onto the battlefield.
3. Cast Squee from your graveyard by paying 1.
4. Repeat each turn.

This clever loop harnesses the recursive resilience of Squee, the Immortal to continually fuel the sacrifice cost of Fiend Artisan. Once you've established the city's blessing to meet its activation requirement, Timestream Navigator tucks itself away to grant you an extra turn. On that extra turn, Fiend Artisan fetches the Navigator back out of your library by sacrificing Squee, who simply ignores his trip to the graveyard by being recast directly from there.