Collector's Vault + Clock of Omens + Krark-Clan Ironworks + Xorn

Collector's Vault

Clock of Omens

Krark-Clan Ironworks

Xorn

How it works

1. Activate Collector's Vault by paying 2 and tapping it, causing you to loot and create two Treasure artifact tokens.
2. Activate Clock of Omens by tapping the Treasures, untapping Collector's Vault.
3. Activate Krark-Clan Ironworks by sacrificing a Treasure, adding CC.
4. Repeat.

This clever contraption uses Clock of Omens as the central engine, allowing you to continually untap your other artifacts by paying the tapping cost with two of them. Xorn supercharges this loop by turning the single creation trigger from Collector's Vault into a wealth of extra Treasure tokens, which supply both the necessary tap targets for Clock of Omens and the fodder needed for Krark-Clan Ironworks to fuel the mana costs and keep the vault opening over and over again. As you cycle through your deck with Collector's Vault's looting ability, you generate an endless cascade of draws, discards, and colorless mana alongside a massive hoard of treasure.