It presents a threat that must be dealt with if the artifact player wants to advance their gameplan at all, making this a fantastic sideboard card and a generally good stax piece
With a shift of three, Kida can get into the game early thanks to both her Atlantean and Royal Warrior variations
Venat, Heart of Hydaelyn // Hydaelyn, the Mothercrystal This three-drop White transforming on-curve 3/3 has a cast trigger to draw for a legendary spell - not dorks like Serah above but them all, and on any turn, but just once
You can't put a Teferi's Moat out there for a long, long time against decks unknown with the knowledge that an enchantment removal or bounce spell will almost certainly kill you unless you are very brave, and once you start down the Moat road it's hard to stop
However, Cinderella really justifies a high cost, with an ability that sees her counting as a 9 Ink character when singing Songs, as well as a bonus that sees her adding 1 Lore to every other Princess character when she does sing on a turn