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Buying units?

Is it hard to get good champs at this game without buying units? If so, what holiday offers are worth it?
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If you have the time then grind in the arena. Join an active alliance that participates in at least 2 BGs in AW.
Also, read my beginner's guide if you're new to the game. You can click on my profile name and search for the beginner's guide I posted sometime last October.
Don't waste money on an extremely low chance of getting 4*s and 5*s.
There are usually unit offers that come around every month or so. Those would be the best time to buy them because you're getting something along with the units you're paying for.
Good luck and keep that $$$ for better deals. Don't waste your money.
http://forums.playcontestofchampions.com/en/discussion/35054/must-read-this-if-youre-just-new-to-the-game-honest-beginners-advice-pdf-version#latest