You can only control 1 "Dovelgus, Generaider Boss of Iron". (Quick Effect): You can Tribute any number of "Generaider" monsters and/or Machine monsters; Special Summon, from your hand, in Defense Position, exactly that many "Generaider" monsters and/or Machine monsters, all with different names from each other and from the Tributed monsters. You can only use this effect of "Dovelgus, Generaider Boss of Iron" once per turn.