Gogo, Master of Mimicry + High Tide + Retreat to Coralhelm + Swarm Intelligence + Relm's Sketching

Gogo, Master of Mimicry

High Tide

Retreat to Coralhelm

Swarm Intelligence

Relm's Sketching

How it works

1. Cast High Tide by paying .
2. Cast Relm's Sketching by paying its mana cost, targeting an Island you control.
3. Swarm Intelligence triggers.
4. Holding priority, activate Gogo by paying 2 and tapping it, copying the Swarm Intelligence ability.
5. Resolve the copy of Swarm Intelligence's ability, copying the Relm's Sketching spell, targeting an Island you control that enters the battlefield untapped.
6. Resolve the copy of Relm's Sketching, creating a token copy of the targeted Island.
7. When the Island token enters, Retreat to Coralhelm triggers, untapping Gogo.
8. Activate the Island token by tapping it, adding .
9. High Tide triggers, adding .
10. Repeat from step 4.

This clever loop turns a simple spell into a torrential engine, fueled by High Tide doubling the mana produced every time an Island—or its copy—is tapped. You kick things off by casting Relm's Sketching to duplicate an Island, which naturally triggers Swarm Intelligence; Gogo, Master of Mimicry then steps in to multiply that trigger so you can copy the spell itself. As those copied Island tokens flood the battlefield, Retreat to Coralhelm triggers off each landfall to untap Gogo, readying the mimic to copy the entire process anew.