Inalla, Archmage Ritualist + Timestream Navigator + Erratic Portal

Inalla, Archmage Ritualist

Timestream Navigator

Erratic Portal

How it works

1. Cast Timestream Navigator by paying 1.
2. Timestream Navigator enters the battlefield, triggering Inalla; pay 1 to make a token copy of Timestream Navigator with haste.
3. Activate the token Timestream Navigator by paying 2, tapping it, and putting it on the bottom of your library, taking an extra turn after this one.
4. Activate Erratic Portal by paying 1 and tapping it, returning the original Timestream Navigator to your hand.
5. Repeat each turn.