Kenrith, the Returned King + Oriq Loremage + Timestream Navigator + Zirda, the Dawnwaker

Kenrith, the Returned King

Oriq Loremage

Timestream Navigator

Zirda, the Dawnwaker

How it works

1. Activate Kenrith's fifth ability by paying 2, returning Timestream Navigator from your graveyard to your battlefield.
2. Activate Kenrith's first ability by paying , causing all creatures to gain haste.
3. Activate Timestream Navigator by paying 1, tapping it, and putting it on the bottom of your library, causing you to an extra turn after this one.
4. Activate Oriq Loremage by tapping it, searching for Timestream Navigator and put it into your graveyard.
5. Repeat.