Perplex Perplex gets less valuable as a counter the more graveyard decks proliferate in EDH, but having a weak counter you can convert into a Teferi, Time Raveler, a Toxic Deluge, or so many other powerful things when it needs repurposing is great
Since the colors of slivers in the deck skew mostly towards green, duals with green in them will be some of the best choices
A lot of cards show potential in Creative Energy
But which type it counts as can be changed if a new creature with one of the types enters the battlefield
It should also be noted that Chinese has been dropped from the Masters print run, which further reduces the total # of boxes and Masterpieces in circulation
It's already the third-most common Azorius combo after Brago, King Eternal at #1 and Ranar the Ever-Watchful at the two-spot