Lands you control can tap to produce at least ({10} magic symbol) ({R} magic symbol) ({G} magic symbol) ({W} magic symbol) ({W} magic symbol) .
You have enough mana to pay for commander tax, if applicable.
Steps
Activate all mana-producing lands you control by tapping them, adding at least ({10} magic symbol) ({R} magic symbol) ({G} magic symbol) ({W} magic symbol) ({W} magic symbol) .
Cast
Zacama either from your hand or from the command zone by paying ({6} magic symbol) ({R} magic symbol) ({G} magic symbol) ({W} magic symbol) plus commander tax, if applicable.
When
Zacama enters the battlefield, it triggers, untapping all lands you control.
Stormfront Riders enters the battlefield, its first ability triggers, returning it and
Zacama from the battlefield to your hand.
Stormfront Riders' second ability triggers twice, creating two 1/1 Soldier creature tokens.
Repeat.
If lands you control can tap to produce at least ({11} magic symbol) ({R} magic symbol) ({G} magic symbol) ({W} magic symbol) ({W} magic symbol) , this combo nets infinite mana, and you may use that mana to activate