Arbor Elf + Pemmin's Aura + Sheltered Aerie

Arbor Elf

Pemmin's Aura

Sheltered Aerie

How it works

1. Activate Arbor Elf by tapping it, untapping the enchanted forest.
2. Activate the ability granted to the Forest by Sheltered Aerie, adding .
3. Activate Pemmin's Aura by paying , untapping Arbor Elf.
4. Repeat.
5. Once you have infinite blue mana, you may tap the Forest for other colors instead of blue, adding infinite colored mana.