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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
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
It doesnt have too many defense mechanisms, but generally just being able to chump block once or twice (which is obviously way more difficult against the Dragon deck) is enough