Gogo, Master of Mimicry + High Tide + Retreat to Coralhelm + Invasion of Arcavios // Invocation of the Founders + Doppelgang

Gogo, Master of Mimicry

High Tide

Retreat to Coralhelm

Invasion of Arcavios // Invocation of the Founders

Doppelgang

How it works

1. Cast High Tide by paying .
2. Cast Doppelgang by paying its mana cost, targeting an Island you control.
3. Invocation of the Founders triggers.
4. Holding priority, activate Gogo by paying 2 and tapping it, copying the Invocation of the Founders ability.
5. Resolve the copy of Invocation of the Founders's ability, copying the Doppelgang spell, targeting an Island you control that enters the battlefield untapped.
6. Resolve the copy of Doppelgang, 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 intricate loop begins by laying down High Tide to supercharge your blue mana before casting Doppelgang to set up your targets. When Invasion of Arcavios enters the battlefield as a Siege, its front half tutors up your key pieces, while its back half—Invocation of the Founders—provides the crucial spell-copying engine every time you cast an instant or sorcery. Gogo, Master of Mimicry steps in to multiply those triggers, allowing you to feed Doppelgang repeatedly and flood the board with fresh token copies of your lands. Every time one of those new lands arrives, Retreat to Coralhelm triggers to untap Gogo, keeping the entire sequence fueled and ready to run again.