The three ways, I'd guess, are the UDE Points card, which you can use towards things like Ogre Trinkets, then the chance of loot in the DMF pack itself, and the boosters.
The boosters are TTDP because that's what UDE have the most of left in their warehouses, as it was an unpopular set. It's rather controversial, as the French got Azeroth and Outland, and other countries got various boosters.
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