During your upkeep, Endless Evil triggers, creating a 1/1 token copy of Timestream Navigator.
During your next upkeep, Endless Evil triggers, creating a 1/1 token copy of Timestream Navigator.
Activate the ability of a Timestream Navigator token that did not enter the battlefield this turn by paying {2}{U}{U}, tapping it, and putting it on the bottom of your library, taking an extra turn.
Repeat from 2.

Infinite turns

Timestream Navigator

Endless Evil

At the beginning of your upkeep, Endless Evil triggers, creating a token copy of Timestream Navigator.
If you do not have the city's blessing, both Timestream Navigator's ascend abilities trigger, giving you the city's blessing.
Activate Lightning Greaves' equip ability by paying {0}, attaching it to the Timestream Navigator token.
Activate the Timestream Navigator token by paying {2}{U}{U}, tapping it and putting it on the bottom of your library, causing you to take an extra turn after this one.
Repeat each turn.

Lightning Greaves

At the beginning of your upkeep, Endless Evil triggers, creating a 1/1 copy of Jugan.
Put the token Jugan into your graveyard due to the legend rule.
The token Jugan dies, putting five +1/+1 counters on Sage of Hours.
Activate Sage of Hours by removing all +1/+1 counters from it, causing you to take an extra turn after this one.
Repeat each turn.

Combos with "Endless Evil"