Requires

Phyrexian Triniform must be in exile (exiled by Mimic Vat). Clock of Omens must be on the battlefield. Mimic Vat must be on the battlefield. Krark-Clan Ironworks must be on the battlefield. Mana needed:

Steps

1. Activate Mimic Vat by paying and tapping it, creating a token copy of Phyrexian Triniform with haste.
2. Activate Krark-Clan Ironworks by sacrificing the Phyrexian Triniform token, adding .
3. The token Phyrexian Triniform dies, creating three 3/3 Golem artifact creature tokens.
4. Activate Clock of Omens by tapping two Golems, untapping Mimic Vat.
5. Activate Krark-Clan Ironworks by sacrificing a Golem, adding .
6. Repeat.

Results