So this means, to some extent, you can buy: Packs Preoconstructed Decks The way to do this is through Gray Viking Games
The Release Notes for this set will have additional information on more complex interactions with double-faced cards
Of course, actually activating the freerunning cost is the conundrum that all of these cards present, but it's very easy to see a world where more Assassins and Changelings are printed
If your opponent is comboing with creatures, say Splinter Twin + Pestermite, youll gladly pay 3 mana the next turn if youre still in the game
Protection Lastly, we have protection
For those looking to jump into the game, one of Fableds two Starter decks is a solid place to start