Well at least you got an exotic. I am in the middle of doing strikes to get exotics, I have done 15 so far today, and used a 3 of Coins in each one, and not one single exotic. Actually, I have yet to get an exotic drop at all from TTK. No matter how many strikes, missions, PVP, anything, I have yet to get one exotic drop. I don't think the 3 of Coins is worth it at all. I'll just wait to get it from Xur.