Like most Magic: The Gathering cards, the value of Archfiend of Despair depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Battlebond)
One buffs all of your other Demons, Devils, Imps, and Tieflings by +1/+1 and grants them lifelink, while the other summons a 1/1 Devil token each end step if a creature entered your graveyard that turn
This may be a great way to hold the board early and get value throughout the game if some fast and heavy blue control decks get moving in Standard
Tangle: B A two-mana fog that keeps the attacking creatures tapped for a turn
Its no wonder that Mox Ruby has been a staple in Vintage and an essential piece in Magic the Gatherings competitive history
Wizards attempted that approach recently in Edge of Eternities and got a lot of backlash, so the two-side method looks like itll be the norm going forward