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I prefer to build a decent deck myself and know how everything works, rather than relying on random chance.
And why farm? I'm a free-to-play player, and I don't complete dailies every day. I can't afford to watch all the cool memes on YouTube, of course, but I have almost optimal or even perfectly assembled decks for all classes, including Knight Sword and Knight Haven (not all legendaries are in a full set, but it's still quite playable). The thing is, some classes are better in rotation, while with others, you can only get something going in unlimited mode.