MTG >Combos >Composite Golem +Phyrexian Metamorph +Scrap Trawler +

Cast Phyrexian Metamorph as a copy of Composite Golem Sacrifice Phyrexian Metamorph to add five mana Scrap Trawler's ability will trigger, return Phyrexian Metamorph to your hand Pay four mana and cast Phyrexian Metamorph again repeat the process