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They decided to keep it to just three larger-than-life characters

Tezzeret, the Conspirator has a casting cost of two generic, one blue, and one black mana, enters the battlefield with five loyalty counters and has the following abilities (credit for ability translation goes to reddit user jack651411): +1: Create a colorless artifact token named "Etherium Stone," which has "Tap: Sacrifice this and add one mana of any color into your mana pool"

It gets its combat stats based on the number of lands you control, and it even returns all lands from your graveyard to the battlefield tapped when it enters

As Mark Rosewater has stated, red could definitely support a ritual that generated every color of mana like this