Cast Spark Double by paying its mana cost, choosing to have it enter the battlefield as a copy of Felidar Guardian
When Spark Double enters the battlefield, it triggers, blinking Felidar Guardian.
When Felidar Guardian enters the battlefield, it triggers, blinking Spark Double. Choose to have Spark Double enter the battlefield as a copy of Felidar Guardian.
Repeat from step 2.

Infinite LTB

Infinite ETB

Spark Double

Felidar Guardian

Cast Spark Double having it enter as a copy of Felidar Guardian.
It enters and blinks Felidar and a land.
Tap the land for mana.
Felidar Guardian enters blinking a land and Spark Double.
Tap the land.
Repeat.

Infinite blinking

Infinite colored mana

Infinite landfall triggers

Panharmonicon

Cast Spark Double by paying {3}{U}.
Spark Double enters the battlefield as a copy of Felidar Guardian, triggering Altar of the Brood and itself.
Resolve the Altar of the Brood trigger, causing each opponent to mill a card.
Resolve the Spark Double's trigger, blinking Felidar Guardian.
Felidar Guardian enters the battlefield, triggering Altar of the Brood and itself.
Resolve the Altar of the Brood trigger, causing each opponent to mill a card.
Resolve the Felidar Guardian's trigger, blinking Spark Double.
Repeat from step 2.

Infinite mill

Altar of the Brood

Activate Daretti's second ability by removing two loyalty counters from them, sacrificing any other nonland permanent and returning Spark Double from your graveyard to the battlefield.
Spark Double enters the battlefield as a nonlegendary copy of Daretti.
Activate Spark Double's second ability by removing two loyalty counters from it, sacrificing Spark Double and returning Felidar Guardian from your graveyard to the battlefield.
Felidar Guardian enters the battlefield, blinking Daretti.
Repeat, sacrificing Felidar Guardian in step 1.

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