Vigean Graftmage + Fertile Ground + Nature's Revolt

Vigean Graftmage

Fertile Ground

Nature's Revolt

How it works

1. Play the land that taps for multiple mana.
2. That land enters as a creature due to Nature's Revolt, triggering Vigean Graftmage's Graft ability, allowing you to move a +1/+1 counter from Vigean Graftmage to that land.
3. Cast Fertile Ground by paying 1, attaching it to that land creature.
4. Activate that land by tapping it, adding at least two mana.
5. Fertile Ground triggers, adding at least one additional mana.
6. Activate Vigean Graftmage by paying 1, untapping the land creature.
7. Repeat.

This brilliant loop transforms your mana base into an engine by turning every land into a creature with Nature's Revolt, allowing Vigean Graftmage to place a +1/+1 counter on them as they enter. Once enchanted with Fertile Ground, that land taps to produce a surplus of mana that comfortably pays the activation cost to untap the land creature with Vigean Graftmage again and again. Because the graftmage's untap ability only requires a counter and a modest mana investment, you end up generating infinite mana of any color your lands can produce.