I remember playing this card long time ago. It was played simply by using card such as big piece golem, gaia plate, valkyrion, and darkness neosphere with Trade-in as its drawing engine.
This is an OTK deck. Dark fusion meant to bring it out so it reduce the risk of being disrupted by targeting effect. Using infernal gainer means it can attack twice, and valkyrion + neosphere mean 7500 ATK