Phyrexian Triniform + Nim Deathmantle + Phyrexian Altar

Phyrexian Triniform

Nim Deathmantle

Phyrexian Altar

How it works

1. Sacrifice Phyrexian Triniform to Phyrexian Altar to add 1 of any color.
2. Phyrexian Triniform and Nim Deathmantle both trigger.
3. Resolve Phyrexian Triniform's ability first, creating three Golem artifact creatures.
4. Sacrifice all three Geolems to Phyrexian Altar to add a total of 3 1 of any color.
5. Resolve the Nim Deathmantle trigger, paying the 4 to return Phyrexian Triniform to the battlefield with Nim Deathmantle equipped.
6. Repeat for infinite ETB and LTB.