You control at least one nontoken creature with base toughness two or greater.
({1} magic symbol) ({WB} magic symbol) available.
Steps
Cast Cauldron Haze by paying ({1} magic symbol) ({WB} magic symbol) , giving Archaeoamncer and at least one additional creature with base toughness two or greater persist until end of turn.
Activate Phyrexian Altar by sacrificing Shipwreck Dowser and the additional creature, adding ({1} magic symbol) ({WB} magic symbol) .
When the creatures die, their persisit abilities trigger, returning themselves from your graveyard to the battlefield with zero -1/-1 counters due to Solemnity.
When Shipwreck Dowser enters the battlefield, it triggers, returning Cauldron Haze to your hand from your graveyard.
Repeat.
If you control an additional nontoken creature with base toughness two or greater, you may also sacrifice and return it to get infinite colored mana.