Theyre printed on cardstock with a distinct layering process involving a blue core in older cards (and similarly structured core in modern ones)
Control decks want to be able to slow down the game by handling early aggressive plays that might do critical damage prior to mass removal, they want to be able to do multiple things in a turn and they want to be able to snipe out tenacious creatures that might survive a mass removal spell
The non-foil version of this card, ironically, is worthless
Auras attached to creatures exiled with Haytham Kenway's last ability will be put into their owners' graveyards
And dont overlook creature lands like Den of the Bugbear, Faceless Haven, or Mutavaultthey give you extra threats without costing you a spell, which is perfect when you start to run low on gas
Left alone, she quietly protects the most important threat on the board every turn