Sure, cards like the Giratina V Alternate Art from Lost Origin and other Sword and Shield era alternate art cards gained a ton of value in just their raw single form, but the price of their graded 10s grew an exponential amount in the same timeframe
You get a full hand of seven cards whenever its cast, you get a giant 12/12 body thats difficult to block effectively, and you get to turn any card in your hand into a counterspell
Each booster contains borderless cards, showcase cards, gorgeous foils, and a card with a special treatment that celebrates the glory of Phyrexia
The deck is reliant on specific cards so I'm running a much higher than average amount of tutors: Trinket Mage to find our busted mana rocks, Tribute Mage to find Throne of Geth simply the best card in the 99, Solve the Equation and Mystical Teachings to find our poison cards, and Ringsight to find any black/blue card with Venser out, plus gives him skulk to get around blockers
For general card quality Demonic is not all that yet it retains a high rating because it can allow for more unusual decks and very specific card quality
A lot of great support cards for these themes are dirt cheap right now, and ripe to buy
