Activate Phyrexian Altar by sacrificing Ozox, adding 1.
When Ozox dies, it and Pawn of Ulamog trigger.
Resolve the Ozox trigger, creating a legendary 2/1 Jumblebones creature token.
Resolve the Pawn of Ulamog trigger, creating a creature token.
Activate Phyrexian Altar twice by sacrificing Jumblebones and the other creature token, adding 1.
When Jumblebones dies, it triggers, returning Ozox from your graveyard to your hand.
Cast Ozox by paying 2.
Repeat.
This clever recycling engine is fueled by Pawn of Ulamog, which quietly watches your non-token creatures die to continuously supply you with sacrificial fodder. When you use Phyrexian Altar to sacrifice Ozox, the Clattering King, both Ozox and the Pawn trigger to yield a fresh Eldrazi Spawn and a Jumblebones token. Jumblebones then serves as the bridge back home: sacrificing it to the Altar not only nets you mana, but its leaves-the-battlefield trigger returns Ozox straight from your graveyard to your hand, ready to be cast again and repeat the loop.