Voltaic Key Combos
Time Vault + Voltaic Key
Kurkesh, Onakke Ancient + Magistrate's Scepter + Voltaic Key
Voltaic Key + Rings of Brighthearth + Timeless Lotus
Voltaic Key + Rings of Brighthearth + Metalworker
Voltaic Key + Rings of Brighthearth + Everflowing Chalice
Voltaic Key + Rings of Brighthearth + Chromatic Orrery
Voltaic Key + Empowered Autogenerator + Rings of Brighthearth
Rings of Brighthearth + Voltaic Key + Candelabra of Tawnos
Prototype Portal + Gonti's Aether Heart + Voltaic Key
Kurkesh, Onakke Ancient + Strionic Resonator + Voltaic Key
Ashnod the Uncaring + Bolas's Citadel + Voltaic Key
Kurkesh, Onakke Ancient + Lithoform Engine + Voltaic Key
Combo result
Infinite colored mana. Infinite sacrifice triggers. Infinite creature tokens if applicable. Infinite ETB if applicable.
Prerequisites
Dockside Extortionist in hand. All other permanents on the battlefield. For infinite mana, is required, and your opponents must have at least 3 artifacts and/or enchantments. For infinite creature tokens and mana, is required, and your opponents must have at least 4 artifacts and/or enchantments.