Nim Deathmantle + Ashnod's Altar + Ashaya, Soul of the Wild + Zendikar's Roil

Nim Deathmantle

Ashnod's Altar

Ashaya, Soul of the Wild

Zendikar's Roil

How it works

1. Activate Ashnod's Altar by sacrificing Ashaya, adding CC.
2. When Ashaya dies, Nim Deathmantle triggers, causing you to pay 4 to return Ashaya from your graveyard to the battlefield, and attaching Nim Deathmantle to it.
3. When Ashaya enters the battlefield, Zendikar's Roil triggers, creating a 2/2 Elemental creature token.
4. Activate Ashnod's Altar by sacrificing the creature token, adding CC.
5. Repeat.
6. If you control a nontoken creature that has haste, you may instead sacrifice it, and then tap it each iteration to get infinite green mana and colorless mana.