I think they add an interesting interaction to the game and, much like planeswalkers, they wont be excessively pervasive to the point that well need to modify almost everything about how we play
Crimson Dragon target Auxila to summon Loading
He attempts to use his Cube on Kaiba, but Kaiba readies his Duel Disk, which counters the effect of the Cube and causes the Plana to retreat in terror, bar Manny
And I dont buy that every single card Wizards produces is meant to be played withdoes that standard apply to Heroes of the Realm, or Ponies: the Galloping, or the Holiday Cards
#10: Lilianas Contract With access to 132 Demons in Commander as of this writing, Lilianas Contract seems to be heavily in our favor
A turn one or even two Inquisition really puts you in the driver's seat for the game