For cube, I've been thinking more and more about cards a) that can block well, b) provide some measure of additional utility or value, and c) aren't too oppressive to aggro strategies
Authentic Pokmon cards that use holographic foiling have a distinct texture that you can feel when you touch the card
It's a great mana sink if you have nothing else to do, but the real draw here is that "mill that many cards plus four" ability
Consequently, Inquisition of Kozilek basically ends up functioning as Thoughtseize, without costing you the additional life loss
The chaos effect allowing you to spread the counters around your creatures is very nice, as a single piece of removal wont entirely erase the effect
I would be remiss to leave Celestial Purge out of a ranking of the best sideboard cards in the format