Please note that the listed percentages add up to 200%, because theres two slots
It makes use of several other key cards like Argothian Opportunist that just miss the top 3 commons, as Green is fairly deep here with good commons
While the first ability suggests youd limit this card for more aggressive decks, you can even neutralize a blocker for the benefit of another opponent in a multiplayer format like Commander
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
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
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