There are plenty of black cards that give infect, such as Glistening Oil and Phyresis
At around $15, it's basically the same price as Craterhoof Behemoth, now that multiple successive reprints have cratered that green giant's value
Combine that with Giada being legendary and costing only 2 mana, and youve also got a very popular and powerful commander for angel decks
The biggest shift came in 2008 with the Mythic Rare, created to give the games most epic cards, like Planeswalkers, a special home without crowding out tournament-staple rares
This is because booster packs and boxes from each half of the dual set are sold separately
Unless something drastically changes to remove the overall potency of Mono Black, Orzhov, Rakdos, Golgari, or Dimir, I would expect to see Demonic Embrace to be one enchantment that will never go away in standard until rotation