Kashtira Fenrir , Kashtira Unicorn and Kashtira Ogre all have the same conditions to activate their effect: if they declare an attack, or if an opponent's monster activates their effect , once per turn they can banish cards, face-down
The bonus for me is the order in which you do this, scry lets you put a cheerio or land back under your library and gives you a chance at a card with greater impact
While a card with the Book subtype won't automatically contain a common ability (e.g., drawing cards), it's possible that future cards will refer to the Book subtype
You can attack on your turn, then use this to ambush the opponents during combat with a surprise 3/4 flier and a newly untapped creature that you blink
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