Heavily Played (HP) copies drop as low as $13, while moderately played (MP) can jump into the $26 range
It turns out, however, that it has a lot more to offer than just that
Watermark: Obscura Illustrated by Josh Hass Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Legal Modern Not Legal Brawl Legal Legacy Not Legal Comp
Errant and Giada lets you look at the top card of your library whenever you want (with one restrictionsee below), even if you don't have priority
So a Prodigal Sorcerer can deal 1 damage to kill the Rootwall before that ability resolves, but after the cost for the ability has been paid
A high grade could greatly increase a card's value, for example, someone recently paid US$129.99 (RM544) for a PSA 9 version of the Vaporeon card above