You know an alter is top notch when you confuse it with a photograph
The simple look is something that puts me off a little bit, but ultimately that boils down to personal preference
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
With the exception of basic lands (Plains, Island, Swamp, Mountain, Forest, and Wastes), your combined deck and sideboard may not contain more than four of any individual card, counted by its English card title equivalent