MTG Goldfish is working on a tool like that but it is a paid service.
http://www.mtggoldfish.com/superbrewHave you introduced your friends to the rule of 9 and mana curve?
http://www.gatheringmagic.com/magic-the-classroom-the-rule-of-nine/9 playsets of cards and 24 lands make a 60 card deck.
A deck that curves out can win just on that basis some of the time. I would recommend starting mono colored as well.
60 Cards, play first
9 at one, 8 at two, 8 at three (One added here to make 60 cards), 11 at four, 24 Land.
60 cards, draw first
8 at one, 7 at two, 6 at three, 5 at four, 9 at five, 25 Land.