Against aggressive decks, you want to kill their creatures or counter their spells, and against control, you want to stick a threat and ride it to victory, using your counterspells to protect your threats or to counter their bigger threats
I can see it in some kind of low-to-the-ground aggro build, as you can pump up your attackers in various ways as it progresses
Again, promo foils are the only shiny ones out there
To demonstrate just how ridiculous this idea is, this meme shows us how doing the same thing with Pokmon would look
Only eight of these cards have ever been graded with PSA making it one of the rarest Pokmon cards of all time
Me: I'd like help designing a new Magic the Gathering card for a custom set I'm designing that's X-Files themed