Activate Selvala by paying {G} and tapping it, adding at least {3}{G}{U}.
Activate Niblis by paying {U} and tapping it, targeting itself.
Rings of Brighthearth triggers, causing you to pay {2} to copy Niblis' ability, targeting Selvala.
Resolve both Niblis abilities, untapping Niblis and Selvala.
Repeat.

Infinite colored mana

Infinite mana creatures you control can produce

Infinite untap of creatures you control

Niblis of the Breath

Rings of Brighthearth

Selvala, Heart of the Wilds

Activate Heronblade Elite by tapping it, adding at least {U}{U}{U}{U}.
Activate Niblis by paying {U} and tapping it, targeting itself.
Rings of Brighthearth triggers, causing you to pay {2} to copy Niblis' ability, targeting Heronblade Elite.
Resolve both Niblis abilities, untapping Niblis and Heronblade Elite.
Repeat.

Heronblade Elite

Activate Wirewood Channeler by tapping it, adding at least {U}{U}{U}{U}.
Activate Niblis by paying {U} and tapping it, targeting itself.
Rings of Brighthearth triggers, causing you to pay {2} to copy Niblis' ability, targeting Wirewood Channeler.
Resolve both Niblis abilities, untapping Niblis and Wirewood Channeler.
Repeat.

Wirewood Channeler

Activate Accomplished Alchemist's second ability by tapping it, adding at least {U}{U}{U}{U}.
Activate Niblis by paying {U} and tapping it, targeting itself.
Rings of Brighthearth triggers, causing you to pay {2} to copy Niblis' ability, targeting Accomplished Alchemist.
Resolve both Niblis abilities, untapping Niblis and Accomplished Alchemist.
Repeat.

Accomplished Alchemist

Activate Sanctum Weaver by tapping it, adding at least {U}{U}{U}{U}.
Activate Niblis by paying {U} and tapping it, targeting itself.
Rings of Brighthearth triggers, causing you to pay {2} to copy Niblis' ability, targeting Sanctum Weaver.
Resolve both Niblis abilities, untapping Niblis and Sanctum Weaver.
Repeat.

Combos with "Niblis of the Breath"