Cast Deepglow Skate by paying {4}{U}.
Deepglow Skate triggers, doubling the number of counters on Saheeli.
Activate Saheeli's -7 ability to create a token copy all permanents you control.
Put the oldest Saheeli, The Gifted into the graveyard with the legend rule.
The Deepglow Skate token triggers, doubling the number of counters on the remaining Saheeli.
Repeat from step 3.

Infinite copies of permanents you control

Infinite creature tokens

Infinite mana lands and artifacts you control can produce

Mycosynth Lattice

Saheeli, the Gifted

Deepglow Skate

Cast Deepglow Skate by paying {4}{U}.
When Deepglow Skate enters the battlefield, it triggers, doubling the number of loyalty counters on Saheeli.
Activate Saheeli's third loyalty ability by removing seven loyalty counters from it, creating a token copy of each permanent you control.
Put the nontoken Saheeli into your graveyard due to the legend rule.
When the Deepglow Skate token enters the battlefield, it triggers, doubling the number of loyalty counters on Saheeli.
Repeat from step 3.

Infinite copies of nonland permanents you control

Infinite creature tokens with haste

Infinite mana artifacts you control can produce

Encroaching Mycosynth

Activate Saheeli's first loyalty ability by putting a loyalty counter on it, creating a 1/1 Servo artifact creature token.
At the beginning of your end step, Teleportation Circle triggers, blinking Myr Battlesphere.
When Myr Battlesphere enters the battlefield, its first ability triggers, creating four 1/1 Myr artifact creature tokens.
Activate Time Sieve by tapping it and sacrificing the Myrs and Servo, causing you to take an extra turn after this one.
Repeat each turn.

Combos with "Saheeli, the Gifted"