Float {10} mana in your mana pool.
Activate Doubling Cube by paying {3} and tapping it, causing you to add {7}.
Activate Voltaic Key by paying {1} and tapping it, targeting Doubling Cube.
Rings of Brighthearth triggers, causing you to pay {2} to copy Voltaic Key's ability, targeting Voltaic Key.
Resolve both Voltaic Key abilities, untapping Voltaic Key and Doubling Cube.
Repeat from step 2.

Infinite mana permanents you control can produce

Infinite untap of artifacts you control

Doubling Cube

Voltaic Key

Rings of Brighthearth

Activate Karn's first loyalty ability by putting a loyalty counter on it, causing Doubling Cube to become an artifact creature until end of turn.
Activate Umbral Mantle's equip ability by paying {0}, attaching it to Doubling Cube.
Float at least {10} in your mana pool.
Activate Doubling Cube by paying {3} and tapping it, adding at least {7}.
Activate Doubling Cube by paying {3} and untapping it, giving it +2/+2 until end of turn.
Repeat from step 4.

Infinitely large creature until end of turn

Infinite untap of creatures you control

Karn, the Great Creator

Umbral Mantle

Float at least {11} in your mana pool.
Activate Doubling Cube by paying {3} and tapping it, adding at least {8}.
Activate Karn's first loyalty ability by putting a loyalty counter on it, causing Doubling Cube to become an artifact creature until end of turn.
Activate Sword of the Paruns' equip ability by paying {3}, attaching it to Doubling Cube.
Activate Sword of the Paruns by paying {3}, untapping Doubling Cube.
Activate Doubling Cube by paying {3} and tapping it, adding at least {7}.
Repeat from step 5.

Sword of the Paruns

Float at least {12} in your mana pool.
Activate Doubling Cube by paying {3} and tapping it, adding at least {9}.
Activate Karn by paying {1}, causing Doubling Cube to become an artifact creature until end of turn.
Activate Sword of the Paruns' equip ability by paying {3}, attaching it to Doubling Cube.
Activate Sword of the Paruns by paying {3}, untapping Doubling Cube.
Activate Doubling Cube by paying {3} and tapping it, adding at least {8}.
Repeat from step 5.

Karn, Silver Golem

Activate Doubling Cube by paying {3} and tapping it, doubling your unspent mana.
Activate Karn by paying {1}, causing Doubling Cube to become an artifact creature until end of turn.
Cast Freed from the Real by paying {2}{U}, enchanting Doubling Cube.
Activate Freed from the Real's second ability by paying {U}, untapping Doubling Cube.
Activate Doubling Cube by paying {3} and tapping it, doubling your unspent mana.
Repeat from step 4.

Infinite colored mana

Infinite colorless mana

Freed from the Real

Activate Lord of the Forsaken by paying seven life, adding seven {C} that can only be spent to cast spells from your graveyard.
Activate Doubling Cube by tapping it and paying {3}, doubling your unspent mana to at least 14 {C}, seven of which can only be spent to cast spells from your graveyard.
Activate Emiel the Blessed by paying {3}, exiling and returning Felidar Guardian to the battlefield.
Felidar Guardian enters, exiling and returning Doubling Cube to the battlefield.
Repeat from step 2.

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