At the beginning of your upkeep, Genesis triggers, causing you to pay {2}{G} to return it from your graveyard to your hand.
Activate Timestream Navigator by paying {2}{U}{U}, tapping it, and putting it from the battlefield onto the bottom of your library, causing you to take an extra turn after this one.
Activate Fauna Shaman by paying {G}, tapping it and discarding Genesis, searching your library for Timestream Navigator and putting it into your hand.
Cast Timestream Navigator by paying {1}{U}.
Repeat each turn.

Infinite turns

Fauna Shaman

Timestream Navigator

Genesis

Activate Timestream Navigator by paying {2}{U}{U}, tapping it, and putting it from the battlefield onto the bottom of your library, causing you to take an extra turn after this one.
If you do not have a creature card in hand, activate Undertaker by paying {B}, tapping it and discarding a card, returning a creature card from your graveyard to your hand.
Activate Fauna Shaman by paying {G}, tapping it and discarding a creature card, searching your library for Timestream Navigator and putting it into your hand.
Cast Timestream Navigator by paying {1}{U}.
Repeat each turn.

Skip your draw step

Undertaker

Activate Timestream Navigator by paying {2}{U}{U}, tapping it, and putting it from the battlefield onto the bottom of your library, causing you to take an extra turn after this one.
Activate Liliana's first ability by putting a loyalty counter on it, returning a creature card from your graveyard to your hand.
Activate Fauna Shaman by paying {G}, tapping it and discarding a creature card, searching your library for Timestream Navigator and putting it into your hand.
Cast Timestream Navigator by paying {1}{U}.
Repeat each turn.

Liliana, Death Mage

At the beginning of your upkeep, Ravos triggers, causing you to return a creature card from your graveyard to your hand.
Activate Timestream Navigator by paying {2}{U}{U}, tapping it, and putting it from the battlefield onto the bottom of your library, causing you to take an extra turn after this one.
Activate Fauna Shaman by paying {G}, tapping it and discarding a creature card, searching your library for Timestream Navigator and putting it into your hand.
Cast Timestream Navigator by paying {1}{U}.
Repeat each turn.

Combos with "Fauna Shaman"