Rings of Brighthearth, Galvanic Key, Candelabra of Tawnos, and High Tide

Prerequisites

• Rings of Brighthearth on the battlefield
• Galvanic Key on the battlefield
• Candelabra of Tawnos on the battlefield
• High Tide in hand
• You control at least two Islands
• available

Steps

1. Cast High Tide by paying , causing all Islands to add an additional when they are tapped for mana this turn
2. Activate two Islands you control by tapping them, adding
3. Activate Candelabra of Tawnos by paying and tapping it
4. Rings of Brighthearth triggers, causing you to pay 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
7. Resolve the second Candelabra of Tawnos ability, untapping the two Islands
8. Activate Galvanic Key by paying and tapping it
9. Rings of Brighthearth triggers, causing you to pay to copy Galvanic Key's ability
10. Resolve both Galvanic Key abilities, untapping Galvanic Key and Candelabra of Tawnos
11. Repeat from step 2

Results

• 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