a good chunk of it is that a lot of them are just cool fantasy people in cool fantasy poses, but there's not much for me to say because even just four sets in and without any particular differentiator or story, there's not much to say about 'another knight', 'another priestess' or 'another archer'
This will not include oddities such as fillers, playtest cards, test prints, card that left with employees of the print shops or WotC, or any items of that nature
New players tend to ignore the second main phase and cast all of their stuff during the first main phase
Youll probably win before that happens if youre connecting every turn, but thats a nice free bonus
The Thick 3D Grey stamps, like the one above, recently got a new theory as to what might have caused them