As of Innistrad: Crimson Vow, there are 36 cards with Partner With : seven blue, seven red, six white, six black, and five green
A well known fact, from the days before you had to play with sleeves, was also that the first printings of Mirage was far more glossy than other sets (same with some printings of Antiquities), which made Mirage lands sough after by semi-cheaters who wanted to be able to see if the top card of their library was a basic land
Here's some quick links to keep you on top of the situation, just bear in mind that the pricing will almost certainly be above MSRP and in-line with current market values: What's inside Phantasmal Flames products
Either way, youre still denying valuable resources to other players
Trading could be a perfect solution to this , particularly as plenty of other players will likely have complimentary spaces in their own collections