Here we see Mickey as a steampunk detective, investigating some vibrant seaweed
If the Evoke cost is paid, the creature is sacrificed when it enters the battlefield
It's hard to stop, and the number of cards that exist that can feasibly answer it are few
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
You want cards entering and leaving your graveyard as often as possible to trigger Teval's ability