Doubling Cube + Voltaic Key + Rings of Brighthearth

Prerequisites

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Steps

1. 1Float mana in your mana pool.
2. 2Activate Doubling Cube by paying and tapping it, causing you to add .
3. 3Activate Voltaic Key by paying and tapping it, targeting Doubling Cube.
4. 4Rings of Brighthearth triggers, causing you to pay to copy Voltaic Key's ability, targeting Voltaic Key.
5. 5Resolve both Voltaic Key abilities, untapping Voltaic Key and Doubling Cube.
6. 6Repeat from step 2.

Effects

• Infinite mana artifacts you control can produce
• Infinite mana permanents you control can produce
• Infinite untap of artifacts you control