Displacer Kitten + Aether Channeler + Mana Vault + Mana Crypt

Displacer Kitten

Aether Channeler

Mana Vault

Mana Crypt

How it works

1. Activate Mana Vault by tapping it, adding CCC.
2. Cast Mana Crypt by paying 0.
3. Displacer Kitten triggers, blinking Aether Channeler.
4. When Aether Channeler enters the battlefield, it triggers, returning Mana Vault from the battlefield to your hand.
5. Activate Mana Crypt by tapping it, adding CC.
6. Cast Mana Vault by paying 1.
7. Displacer Kitten triggers, blinking Aether Channeler.
8. When Aether Channeler enters the battlefield, it triggers, returning Mana Crypt from the battlefield to your hand.
9. Repeat.