I think limiting him to being played one at a time wouldn't be much of a nerf. Against decks with board resets you'd be pretty crazy to play more than one at once anyway. Max 1 per deck though, would be a real nerf (and quite fair IMO).
Related question. What happens when 2 Aeons are in play and you attack? Since they're both protectors can you attack either one? Just the last one cast?
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