Mythos of Illuna, Dual Casting, and Retreat to Coralhelm

Prerequisites

• Mythos of Illuna in hand
• Dual Casting on the battlefield
• Retreat to Coralhelm on the battlefield
• Dual Casting attached to a creature that does not have summoning sickness
• You control at least one basic Mountain
• available

Steps

1. Cast Mythos of Illuna by paying , targeting any permanent
2. Holding priority, activate any Mountain you control by tapping it, adding
3. Activate the creature with Dual Casting attached by paying and tapping it, creating a copy of Mythos of Illuna targeting any basic Mountain you control
4. Resolve the Mythos of Illuna copy, creating a token copy of the basic Mountain
5. The basic Mountain token enters the battlefield, triggering Retreat to Coralhelm, untapping the creature with Dual Casting attached
6. Repeat from step 2

Results

• Infinite landfall triggers
• Infinite magecraft triggers
• Infinite tapped Mountain tokens