So Common cards and Uncommon contain more vanilla cards (with no rules text) or cards with just one keyword, up to 5 or 6 ink cost at max
A powerful Ursula glimmer, unleashed from the Great Illuminary, is at last ready to put plans into motion
It will feature characters from all 16 numbered entries of the Final Fantasy Franchise
Though she has a cost of 7 Ink, Clarabelle is a Floodborn character, which means that she has the Shift keyword, allowing her to be played directly on top of another Clarabelle card, for a reduced cost (in a manner reminiscent of how evolving works in Pokemon)
Specifically it's due to one of the most popular MTG commanders from the set: Vivi Ornitier
You can start playing Arthur then, and either pairing him with Merlin Goat, Rabit, or using him on someone else before bouncing him back to your hand with Madam Mim