Magus of the Coffers and Sword of the Paruns on the battlefield.
Magus of the Coffers is not summoning sick and can tap for mana.
At least six Swamps under your control.
({4} magic symbol) to start the combo (or ({2} magic symbol) and Sword of the Paruns attached to Magus of the Coffers).
Steps
Pay ({2} magic symbol) to activate Magus of the Coffers, adding at least six ({B} magic symbol) (including initial mana, floating ({8} magic symbol) ).
Pay ({3} magic symbol) to attach Sword of the Paruns to Magus of the Coffers (floating ({5} magic symbol) ).
Activate Sword of the Paruns, untapping Magus of the Coffers (floating ({2} magic symbol) ).
Repeatedly tap the Magus for mana and untap it, generating at least ({B} magic symbol) per iteration.