How about something like planar guide? A one drop that not only prevents board wipes, but also let's your creatures renter the battlefield.
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soaring seacliff might be interesting
Thanks! Grave Betrayal is an awesome and powerful card, but i have an aversion to anything costing more than 6 unless the card has immediate game ending affects or is in a deck with excess mana ramp. So... not really a good reason, just a personal preference.
how about epochrasite? since you already have chronozoa. although i know it doesn't have flying
how about Armed // Dangerous. 2 nice abilities and you can combo them pretty devastatingly. you could replace giants growth.
How about Nissa Revane?