By using the effect of "Greed", your opponent will continually take damage as they are forced to draw cards outside of their Draw Phase. "Broken Blocker" helps replace "Defender", "Shield Wing", or "Glow Moss" if they're ever destroyed in battle, while "Dark Door" limits the number of opponent attacks per turn to one, making "Shield Wing" unable to be destroyed by battle. "Cat of Ill Omen" and "Booby Trap E" can retrieve "Greed" if it's removed, and "Galaxy Cyclone" can remove spells/traps that negate "Greed", such as "Royal Decree".