@Spacehawk There is no direct way for your cards to transform. What you have to do is to create each side of the card as separate cards and then give a link to the other part in the comment section.
i've actually made transforming cards. The side that you cast it on is totally normal along with a condition to transform it. The back side is normal as well, except that there is no mana cost. The card still has a color to it, but no mana cost. I've also done planeswalkers that transfrom and it is a similar concept. No mana cost on the second side.
Comments
What you have to do is to create each side of the card as separate cards and then give a link to the other part in the comment section.