They are not legal in official tournament play and are primarily used for practice, learning, or in casual gaming environments where players agree on their use
Here's how the deck looks with the upgrades added: Further Upgrades There's a bunch of heavy-hitter Phyrexians you can toss in the top-end: Elesh Norn, Mother of Machines and Mondrak, Glory Dominus both double the amount of tokens you're incubating with Brimaz which is super sweet, Elesh Norn is a great anthem for incubation, plus there's Sheoldred, Sheoldred, Whispering One, Sheoldred, the Apocalypse (lots of Sheoldreds!),Wurmcoil Engine, Skithiryx, the Blight Dragon
Get ready to mangle some vehicles and Steel Overseers, because Manglehorn is coming
Wax-Wane Witness's last ability triggers just once for each life-gaining or life-losing event, no matter how much life was gained or lost
If you leave the game, the permanents you control from Karn's ability are exiled
Quakestrider Ceratops needs trample to really munching, and twice the power of a Colossal Dreadmaw is nothing to scoff at
