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How about a champion passive that allows their summoner to see dotted lines indicating commands given by enemy summoners telling their champions where to move?
I thought of the idea, but I've also seen it before in Command and Conquer: Red Alert 2. Oh, and more recently in Starcraft 2, the Terrans have a 'detector' tower that keeps track of where enemies are (but not where they've been ordered to move).
This would be a champion that never needs wards, but their skills would need long cooldowns because the summoner would be pinging the minimap incessantly for his teammates.....unless part of the effect is to share the knowledge telepathically with all allied summoners....man that would....be....COOL.
If not a passive, perhaps an ultimate passive (R)?