Repeat step 1 for each other nontoken creature you control.
Cast Rise of the Dark Realms by paying ({7} magic symbol) ({B} magic symbol) ({B} magic symbol) , returning all creature cards from all graveyards to the battlefield under your control.
When Revolutionist enters the battlefield, it triggers, returning Rise of the Dark Realms to your hand from your graveyard.
Repeat.
Results
Infinite colored mana.
Infinite death triggers.
Infinite ETB.
Infinite LTB.
Infinite magecraft triggers.
Infinite sacrifice triggers.
Infinite storm count.
Put all creature cards from all graveyards onto the battlefield under your control.