Be honest, how many times there was only a player left to win the game and you and your team didn't know where he was? ALWAYS (to me tbh) So this is my suggestion. The price should be 3 diamond because it's not really that useful though you can see if you're going to run into someone if you flew (Past form of flee? xD) from another player OR check if there's someone in bases protecting their Wither. Ugh, this makes me think it needs to cost 32 emeralds hehe.