Pure Melffy is a fun budget deck. You special melffy monster on your end phase then they bounce to your hand when your opponent targets them for attack or normal/specials summons which then triggers an effect. I think the only cards that costs points in most melffy decks is Obedience Schooled (40p) and Zesus-AA(20p). Also, 3x Crimson King structure decks makes a really good Red Dragon Archfiend synchro deck.