Cast High Tide by paying {U}.
Activate an Island by tapping it, adding {U}.
High Tide triggers, adding {U}.
Activate Portent Tracker by tapping it, untapping the Island.
Activate Freed from the Real by paying {U}, untapping Portent Tracker.
Repeat from step 2.

Infinite mana lands you control can produce

Infinite blue mana

Infinite untap of lands you control

High Tide

Portent Tracker

Freed from the Real

Activate Anzrag by paying {3}{R}{R}{G}{G}, causing opponents to block Anzrag if able this turn.
Cast Obscuring Haze by paying {0} if you control a commander, or {2}{G} otherwise, preventing all combat damage that would be dealt by opposing creatures this turn.
Declare Anzrag as an attacker, attacking any opponent.
If the opponent does not control a creature, activate Forbidden Orchard by tapping it, adding one mana of any color.
If Forbidden Orchard was activated, it triggers, causing the defending opponent to create a 1/1 Spirit creature token.
If Forbidden Orchard was activated, activate Portent Tracker by tapping it, untapping Forbidden Orchard.
The opponent is forced to block Anzrag, triggering Anzrag, untapping all creatures you control and causing you to get an additional combat phase after this one.
Any combat damage that would be dealt to Anzrag is prevented by Obscuring Haze.
Repeat from step 3 each combat phase.

Infinite combat phases

Infinite untap of creatures you control

Infinite mana creatures you control can produce

Infinite ETB for target opponent

Infinite death triggers for target opponent

Infinite LTB for target opponent

Anzrag, the Quake-Mole

Obscuring Haze

Forbidden Orchard

Activate Gaea's Cradle by tapping it, adding at least six {G}.
Activate Temur Sabertooth by paying {1}{G}, returning Hyrax Tower Scout to your hand.
Cast Hyrax Tower Scout by paying {2}{G}.
When Hyrax Tower Scout enters, it triggers itself, untapping Portent Tracker.
Activate Portent Tracker by tapping it, untapping Gaea's Cradle.
Repeat.
Once you have infinite green mana, you may activate Temur Sabertooth any number of times and recast any creatures castable with green mana any number of times, effectively "blinking" your green creatures any number of times.
You may also activate Portent Tracker any number of times.

Infinite blinking of green creatures

Infinite ETB

Infinite green mana

Infinite LTB

Infinite storm count

Temur Sabertooth

Gaea's Cradle

Hyrax Tower Scout

Activate the land with Squirrel Nest attached by tapping it, creating a 1/1 Squirrel creature token.
When the Squirrel enters, Intruder Alarm triggers, untapping all creatures.
Activate Portent Tracker by tapping it, untapping the land with Squirrel Nest attached.
Repeat.

Infinite creature tokens

Infinite untap of all creatures

Squirrel Nest

Intruder Alarm

Activate a land by tapping it, adding {U}{U}{U} due to Tectonic Split
Activate Portent Tracker by tapping it, untapping Tectonic Split.
Activate Pemmin's Aura by paying {U}, untapping Portent Tracker.
Repeat.

Infinite colored mana

Pemmin's Aura

Tectonic Split

Combos with "Portent Tracker"