Dovelgus, Generaider Boss of Iron

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.

Machine EARTH Effect Monster 9 effect