Myr Battlesphere + Mimic Vat + Clock of Omens + Mana Vault

Myr Battlesphere

Mimic Vat

Clock of Omens

Mana Vault

How it works

1. Activate Mana Vault by tapping it, adding CCC.
2. Activate Mimic Vat by paying 3 and tapping it, creating a token copy of Myr Battlesphere with haste.
3. Myr Battlesphere enters the battlefield, creating four 1/1 Myr creature tokens.
4. Activate Clock of Omens by tapping two Myrs, untapping Mimic Vat.
5. Activate Clock of Omens by tapping two Myrs, untapping Mana Vault.
6. Repeat.