This clever loop turns Mycosynth Lattice into the ultimate architectural engine, as its continuous effect turns every permanent on your battlefield into an artifact. With that global transformation in place, sacrificing a creature to Phyrexian Altar sends it to the graveyard, which immediately satisfies the trigger condition for Krenko, Baron of Tin Street. You can then use the mana generated by the altar to pay Krenko's trigger cost, replacing your sacrificed creature with a fresh Goblin token that can be immediately fed back into the altar to repeat the cycle indefinitely.