Cast Justiciar's Portal by paying {1}{W}, targeting any creature you control.
Holding priority, cast Dualcaster Mage by paying {1}{R}{R}.
Dualcaster Mage enters the battlefield, creating a copy of Justiciar's Portal targeting Dualcaster Mage.
Resolve the copy of Justiciar's Portal, blinking Dualcaster Mage.
Repeat from step 3.

Infinite ETB

Infinite LTB

Infinite magecraft triggers

Dualcaster Mage

Justiciar's Portal

Cast Timestream Navigator by paying {1}{U}.
Timestream Navigator enters the battlefield, triggering Inalla; pay {1} to make a token copy of Timestream Navigator with haste.
Activate the token Timestream Navigator by paying {2}{U}{U}, tapping it, and putting it on the bottom of your library, taking an extra turn after this one.
Activate Erratic Portal by paying {1} and tapping it, returning the original Timestream Navigator to your hand.
Repeat each turn.

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