Isochron Scepter + Clock of Omens + Krark-Clan Ironworks + Encroaching Mycosynth + Raise the Alarm

Isochron Scepter

Clock of Omens

Krark-Clan Ironworks

Encroaching Mycosynth

Raise the Alarm

How it works

1. Activate Isochron Scepter by paying 2 and tapping it, casting Raise the Alarm without paying its mana cost.
2. Resolve Raise the Alarm, creating two creature tokens that are also artifacts due to Encroaching Mycosynth.
3. Activate Clock of Omens by tapping both creature tokens, untapping Isochron Scepter.
4. Activate Krark-Clan Ironworks by sacrificing one creature token, adding CC.
5. Repeat.
6. Once you have infinite tapped tokens, you may sacrifice any number of them to add infinite colorless mana.