Start with aprentice decks, because those are so easy to get to and start a game .
Do not , i repeat, DO NOT compare it to MTG, they will hate this game if you start to compare it to MTG.
This game is more like Chess with magic than MTG. Plus if they are realy hardcore fans of MTG they will not like MW , even if MW is a different type of game than MTG.
Think of it like this, you love say X game, and someone comes and tells you that Y game is so much better than X game then you will go on defence and automaticaly be sceptical about Y and already you are dismiss Y .
I hope you understand
. I hope i helped you.