To establish current value I looked at Ebay, TCGPlayer and StarCityGames and selected the lowest priced copy available, including shipping within the US
More often than not this will trigger when the creature it is attached to dies, but it still draws you a card, hopefully getting you something to replace the fallen creature with
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
If you are worried about opposing fliers, try a spell like Hurricane