Forerunner of the Coalition + Timestream Navigator + Thassa, Deep-Dwelling

Forerunner of the Coalition

Timestream Navigator

Thassa, Deep-Dwelling

How it works

1. Activate Timestream Navigator by paying 2, tapping and putting it on the bottom of your library, causing you to take an extra turn after this one.
2. At the beginning of your end step, Thassa triggers, blinking Forerunner of the Coalition.
3. Forerunner of the Coalition enters, triggering its first ability, causing you to search your library for Timestream Navigator and put it on top of your library.
4. Move to your next turn, drawing Timestream Navigator during your draw phase.
5. Cast Timestream Navigator by paying 1.
6. Timestream Navigator enters the battlefield, triggering Forerunner of the Coalition's second ability, causing each opponent to lose 1 life.
7. Repeat.

By leveraging Thassa, Deep-Dwelling’s end-step trigger, you can repeatedly exile and blink Forerunner of the Coalition to tutor Timestream Navigator straight to the top of your library every single round. Once you recast Timestream Navigator for its mana cost, Forerunner of the Coalition's triggered ability makes sure your opponents slowly bleed out, while Timestream Navigator itself provides the infinite extra turns needed to keep the loop going indefinitely—provided you have achieved the city's blessing.