How can you create a combo with Rings of Brighthearth, Galvanic Key, Candelabra of Tawnos, High Tide?
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[START OF COMBO]This combo can be formed with Rings of Brighthearth, Galvanic Key, Candelabra of Tawnos, High Tide

Color identity: U
Mana cost: {U}
Steps:
  1. Cast High Tide by paying {U}, causing all Islands to add an additional {U} when they are tapped for mana this turn.
  2. Activate two Islands you control by tapping them, adding {U}{U}{U}{U}.
  3. Activate Candelabra of Tawnos by paying {2} and tapping it.
  4. Rings of Brighthearth triggers, causing you to pay {2} to copy Candelabra of Tawnos' ability.
  5. Resolve the first Candelabra of Tawnos ability, untapping the two Islands.
  6. Activate two Islands you control by tapping them, adding {U}{U}{U}{U}.
  7. Resolve the second Candelabra of Tawnos ability, untapping the two Islands.
  8. Activate Galvanic Key by paying {3} and tapping it.
  9. Rings of Brighthearth triggers, causing you to pay {2} to copy Galvanic Key's ability.
  10. Resolve both Galvanic Key abilities, untapping Galvanic Key and Candelabra of Tawnos.
  11. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite mana artifacts you control can produce
  - Infinite mana lands you control can produce
  - Infinite untap of artifacts you control
  - Infinite untap of lands you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Rings of Brighthearth must be on the battlefield
  - Galvanic Key must be on the battlefield
  - Candelabra of Tawnos must be on the battlefield
  - High Tide must be in your hand
  - You control at least two Islands.
[END OF COMBO PREREQUISITES]
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