Essence of Orthodoxy + Summoning Station + Xenograft + Grinding Station

Essence of Orthodoxy

Summoning Station

Xenograft

Grinding Station

How it works

1. Activate Summoning Station by tapping it, creating a 2/2 Pincher creature token.
2. When the Pincher enters the battlefield as a Phyrexian due to Xenograft, Essence of Orthodoxy triggers, creating an Incubator artifact token.
3. When the Incubator enters the battlefield, Grinding Station triggers, untapping itself.
4. Activate Grinding Station by tapping it and sacrificing the Incubator.
5. Summoning Station triggers, untapping itself.
6. Resolve the Grinding Station ability, causing target player to mill three cards.
7. Repeat.