While counterfeit cards harm the community and should be avoided at all costs, the bottom line is that when it comes to casual play with your local playgroup or on your kitchen table, you should do whatever makes the game most fun for you and your playgroup
Every time a set with Krenko is released, we see a small spike in the cards price as Magic players the world over are suddenly reminded oh yeah, this is the best possible goblin card ever created. Its not going to pay for your pack, but you can probably convince someone to trade for it
Every deck contains a decent number of format staples in their colors, from mana rocks to removal
Giada is a great excuse to trot out Mox Amber, and use equipment to shore up the weaknesses of mono-white
Was it tricky to design around the comic book versions with that in mind, or did you enjoy getting back to some of their roots instead