Its over 5% of the set
(Remember, the destroy effect will do nothing to indestructible cards.) However, it will effectively board-wipe the opponents cards removing everything from creatures to enchantments, artifacts, equipment, and lands
Other cards found in the Ursulas Return set that feature this new approach to the Shift keyword include Flotsam & Jetsam, Entangling Eels - which a five strength/five health card that requires two cards to be discarded - Diablo, Devoted Herald, a card that requires players discard an action card, Li Shang, Valorous General - with players needing to discard a character card to Shift it in - Olaf, Carrot Enthusiast, a Sapphire card that can be Shifted by discarding an item card, and steel card Aladdin, Brave Rescuer: which requires that a location card be discard for it to be Shifted
There are plenty of Commanders, including Zur, Eternal Schemer, that benefit from having all your creatures be enchantments as well
their options are just limited to mana abilities and certain special actions
His favorite card of the month is Arcums Astrolabe
