yugioh harpie lady cards question?

ok i used to play yogioh and i always liked the harpie lady cards but i have some ?s

1 in like the 5th season when everyones starts using the pentagram thing mai used cards called harpi lady pheniox formation and harpie lady sperrow formation and harpies feather storm...........ARE THEY REAL CARDS or they just used in the show like other cards

2 all of a sudden yugioh has come back but its not the 5ds crap or the zexia stuff its the first season stuff and like others i get my duleing stradagy from the show and every time mai uses them (not harpie lady sisters) but harpies 1 2 and 3 they can be beat one by one but they attack together and ive seen other duelsts do this and some ppl say they cant do that and the harpie person always says then whats the point of having 3 diffrent harpies with diffrent effects why not just use a bunch of harpie sisters so can harpies 1 2 3 attack one monster all together as if it was one monster

3 this go back to my first ? i sometimes see harpie feather storm on ebay but it says coustome made does that mean its fake

thanks for answereing my ? but dont answere unless you are an experinced duelst this has always been a problem for me and my friends but the rules say nothing about harpies so it kinda leans my way and my friends way this is just such a problem for me being a duelst thanks for answereing my ?