Turns out Red cards that generate mana tend to be extremely popular, while the back side, Harnfel, Horn of Bounty, is basically like a tame Yawgmoth's Bargain where you can just keep drawing cards so long as you have the resources for it
Its the best way to deal with threats before they hit the board, stopping creatures ETB effects and preventing a player from getting an activation off of their planeswalker before you can kill it in combat
TAG advanced, AI-driven system ensures precise, consistent, and transparent grading on a 1,000-point scale
While Wizards certainly can and should reprint it to keep the price down and the card accessible, Oboro, Palace in the Clouds being $80 is just one of those things that happens when low-supply old cards become popular