I'd recommend Portal and its (much better) sequel Portal 2. Excellent puzzle games, good writing, fun characters and short. It should take you abojt 3-5 hours if you have never played a 3D video game before.
Oh and btw the website linked is Steam, the most beloved PC game buying plateform. Be aware that you shouldn't buy the games at full price on stem, check websites like instant gaming, humble bundle or fanatical to get better deals (-80% sometimes!) On these alternative websites you will get a code that has to be activated in the steam app (downloaded on your computer). Search "activate steam game code" on YouTube for explanations on how to do that.
Portal should cost about ~3$ now (it's a 2007 game so it can run on basically anything)
I don't know anything about Magic so I only understood half but thank you for the detailed explanation!