Khor'syur, The Mind Eater

+2: Declare a Colour and draw three cards. For each card of the declared colour, Exile target nonland permanent and discard the rest.
-3: In addition to removing counters to use this ability, pay X mana to cast X cards exiled by Khor'Syur's effects.
-7: Discard the top 5 cards of your library; for each noncreature permanent among them, target opponent exiles the top 2 cards of their libaray.