The Ninja Teen card showcases Karai, Splinters daughter, from before he was transformed by the Mutagen
That's why I put on many mill cards (16 + Thought Scour ), Visions of Beyond will increase my chances to draw a Consuming Aberration or a Wight of Precinct Six .Sideboard is useful in order to defense me with dangerous decks, like burns,tokens, and Eldrazi: 4x Extirpate and 4x Surgical Extraction are very useful with mill decks
Its like eating only belly pork at the buffet
Don't get me started on your myr, or other mana-producing artifact creatures
While Theros: Beyond Deaths cards lack the sly humour and folklore trimmings of previous card set Throne of Eldraine, those things are replaced with something much more horrifying and epic, with all the cosmic trimmings adding an otherworldly tinge to the classic legends