Rings of Brighthearth
Galvanic Key
Candelabra of Tawnos
High Tide

   Prerequisites

What do I need to start this combo?
High Tide in hand.
All other permanents on the battlefield.
You control at least two Islands.
available

   Steps

How does this combo work?
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 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 .
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.

   Results

What do I get from this combo?
Infinite mana artifacts you control can produce
Infinite mana lands you control can produce
Infinite untap of artifacts you control