Ioreth of the Healing House, Arixmethes, Slumbering Isle, Minamo, School at Water's Edge, and Nissa, Worldwaker

Prerequisites

• Ioreth of the Healing House on the battlefield
• Arixmethes, Slumbering Isle on the battlefield
• Minamo, School at Water's Edge on the battlefield
• Nissa, Worldwaker on the battlefield
• Ioreth of the Healing House and Minamo do not have summoning sickness
• Arixmethes is a creature and does not have summoning sickness

Steps

1. Activate Nissa's first loyalty ability by putting a loyalty counter on it, causing Minamo to become a 4/4 Elemental creature that's still a land
2. Activate Arixmethes by tapping it, adding
3. Activate Minamo's second ability by paying and tapping it, untapping Ioreth of the Healing House
4. Activate Ioreth of the Healing House's second ability by tapping it, untapping Minamo and Arixmethes
5. Repeat from step 2

Results

• Infinite green mana