Molten Echoes + Timestream Navigator + Soulherder

Molten Echoes

Timestream Navigator

Soulherder

How it works

1. At the beginning of your end step, Soulherder's second ability triggers, blinking Timestream Navigator.
2. Soulherder's first ability triggers, putting a +1/+1 counter on itself.
3. Timestream Navigator enters the battlefield, triggering Molten Echoes, creating a token copy of Timestream Navigator with haste.
4. Activate the token Timestream Navigator by paying 2, tapping it and putting it on the bottom of your library, causing you to take an extra turn after this one.
5. Repeat each turn.