Non land mana sources that produce 3+ mana (one of which has to be white).
Steps
Cast
Stonecloaker.
Paradox engine triggers untapping all our non-lands.
On resolution,
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
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.
Infinite untap of nonland permanents you control.
Infinite mana nonland permanents you control can produce.