They might have been already printed cards, that were later used in the non-1st edition Shadowless print run, which already had these E ITION printing indication applied to them in an earlier step of the printing process
Beyond those three, its anyones guess, but Ive been through the list of available mechanics and keywords to pick out what seems the most likely: Battlecry A Go Wide strategy is likely given the huge armies and battles in the series, and battlecry is a way to help break stalemates
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For example, Llanowar Tribe, Goreclaw, Terror of Qal Sisma, Steel Leaf Champion, and the like make the most of Ghalta's ability to reduce her cost
It offers you a bit of defense by stunning an opposing creature when you get attacked, and with proliferate, its not untapping any time soon