2/3 The basic design was twofold
It pairs nicely with Legion Warboss as an example of that
How do the card design and art represent the game
While Wizards owns a lot of the IP on Magic cards (the art, mana symbols, etc.) there is t nothing illegal about a piece of cardboard the same size of a Magic card with some unique custom art that might look a bit like a Mox, an Underground Sea, or a Wheel of Fortune
Thurid, Mare of Destiny $22 I have made and lost plenty of money on Crested Sunmare over the years, and even adding red for Shadowfax works thematically, but isnt necessary for Thurid
Second, since Ultra Pro makes sleeves for a ton of different games, there are many different designs available