Cast Miirym either from your hand or from the command zone by paying 3 plus commander tax, if applicable.
Reflections of Littjara triggers, copying the Miirym spell, creating two token copies of Miirym.
Put all but one legendary Miirym into your graveyard due to the legend rule.
When the Miirym tokens enter, Ganax triggers twice, creating four Treasure tokens.
Resolve the original Miirym spell. Choose to put the nontoken Miirym into your graveyard due to the legend rule.
Each Miirym you control and Ganax trigger,
Resolve the Ganax trigger, creating two Treasure tokens.
Resolve a Miirym trigger, creating two token copies of Miirym that aren't legendary.
When the Miirym tokens enter, Ganax triggers, creating two Treasure tokens.
Repeat from step 8 for each remaining trigger, if applicable.
Activate a Treasure by tapping and sacrificing it, adding one mana of any color.
Repeat step 11 until you control no Treasures and/or you have enough mana to cast Miirym from the command zone.
Repeat from step 1.
This brilliant Commander loop begins the moment you cast Miirym, Sentinel Wyrm, which is instantly doubled by Reflections of Littjara choosing "Dragon" to bypass the stack and flood the board with tokens. While the legend rule swiftly keeps your numbers in check, the arrival of these extra dragons triggers Ganax, Astral Hunter to spin up a massive hoard of Treasure tokens. To push this engine into true infinity, Mondrak, Glory Dominus quietly doubles every single token created along the way—whether it's a new copy of Miirym or a freshly minted Treasure. You can then sacrifice those doubled Treasures for infinite colored mana, letting you recast your commander endlessly and repeat the entire spectacle.