Gloom is card #27 of 90 in HS—Undaunted (2010), a Uncommon illustrated by Mitsuhiro Arita. At about $3.58 it is the #75 most valuable card in the set. In a HS—Undaunted booster it turns up about once every 8 packs. It is one of 26 Gloom cards printed so far.
1999Jungle
2002Expedition Base Set
2005Unseen Forces
2008Legends Awakened
2010HS—Undaunted
2015Ancient Origins
2019Unbroken Bonds
2024Paldean Fates

















See the full HS—Undaunted card list
An ungraded Gloom from HS—Undaunted sells for about $3.58. A PSA 10 is worth more, roughly $28.64 by our estimate, and a PSA 9 around $10.02.
It is a Uncommon, and it shows up about once every 8 HS—Undaunted packs.
Mitsuhiro Arita drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open HS—Undaunted booster packs in your browser with the set's real pull rates and keep what you pull in a digital binder. No real cards, nothing to buy.