We're going to start with some hard numbers (brought to us by Frank Karsten, because despite his description of "basic" I have no idea what hypergeometric formulas are - hey, I'm a musician, not a mathematician!), then talk about reasons why we might adjust those numbers some based on goals, play styles, and desires
But there is a way to do something that looks a bit like abovementioned cards
In Collector Boosters, you can find either a borderless Special Guests Elemental (1.9%) or a borderless double-faced planeswalker (1.9%) with textured foiling
Tolarian Academy is a vastly powerful land that is banned in Legacy and restricted in Vintage since it can make so much blue mana
In a bid to catch all the Pokmon, someone just paid $420,000 at auction for a Charizard card