Specifically, Arthur pairs really well with Madam Mim Purple Dragon and various Merlin cards
Each card also has an Ink color, with only up to two colors allowed in each deck
P/T Number 469 Language English Legal Formats Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Timeless, Vintage Not Legal Formats Alchemy, Pauper, Pioneer, Standard Rulings (6/6/2025) "Flashback [cost]" means "You may cast this card from your graveyard if the resulting spell is an instant or sorcery spell by paying [cost] rather than paying its mana cost" and "If the flashback cost was paid, exile this card instead of putting it anywhere else any time it would leave the stack." (6/6/2025) You must still follow any timing restrictions and permissions, including those based on the card's type
Uncommons are often more complex than common cards
Transforming Double-Faced Cards Transforming double-faced cards are a staple of Magic design, and the promise of your permanents transforming to upgraded forms is an exciting one
Its not amazing by any means, but its a fine addition