Non land mana sources that produce 3+ mana (one of which has to be white).
Steps
Cast
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Stonecloaker.
Paradox engine triggers untapping all our non-lands.
On resolution,
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Stonecloaker's ETB effects trigger, to preserve your own graveyard stack them as bounce, then exile, but to just exile all yards, order doesn't matter.
Tap all non-land mana sources for mana.
Responding to the exile trigger by casting
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Stonecloaker again allows you to repeat this process ad nauseum while only selecting a finite number of targets before letting the exile effects resolve.
Results
Infinite ETB.
Exile all cards from all graveyards.
Infinite untap of nonland permanents you control.
Infinite mana nonland permanents you control can produce.