Mercenaries - Can you help review my set?

This is an unfinished set I am working on, mostly for lore and worldbuilding, with little lore tidbits in the comments. The card I am most worried about is Killana, Ascendant because I suck at balancing planeswalkers. I'd love it if someone could give me a little review on how its going.
http://mtgcardsmith.com/user/ChargingBadger/sets/3244

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