Tidewater Minion + Rings of Brighthearth + Lotus Vale

Tidewater Minion

Rings of Brighthearth

Lotus Vale

How it works

1. Activate Tidewater Minion's last ability by tapping it, targeting itself.
2. Rings of Brighthearth triggers, allowing you to pay 2 to copy Tidewater Minion's ability, targeting Lotus Vale.
3. Resolve both Tidewater Minion abilities, untapping Tidewater Minion and Lotus Vale.
4. Activate Lotus Vale by tapping it, adding 3.
5. Repeat any number of times.
6. Once you have infinite mana, you may target any permanent instead of Lotus Vale.