We were even able to have one of the editors for the old Scrye magazine chime in and provide exact details, which I thought was pretty cool: So back in the old days, there was no SCG or TCGplayer to quickly check prices
Each deck has a clear goal in mind, with cards created to attain that goal efficiently, which is great for beginners
Ikoria has introduced not only cards with unusually cheap cycling costs, but also some interesting payoffs for cycling that can have consequences above and beyond card advantage
While both her +1 and -3 are rather underwhelming for five mana, the fact that an unimpeded Nissa can ult after a single turn, and then let you Landfall into a free card for the rest of the game, is just crazy powerful
As a companion it would be ubiquitous in any blue-red-X deck given the formats singleton nature, which gives those decks an extra card for free without any additional deckbuilding costs or restrictions
There are plenty of Greek myths about ghosts and spirits, but Ive never encountered anything resembling the modern notion of a zombie