Misty's Seel is card #88 of 132 in Gym Heroes (2000), a Common illustrated by Atsuko Nishida. At about $4.11 it is the #97 most valuable card in the set. In a Gym Heroes booster it turns up about once every 6 packs. It is one of 20 Seel cards printed so far.
1999Base Set
2000Gym Heroes
2002Legendary Collection
2004FireRed & LeafGreen
2007Mysterious Treasures
2009Supreme Victors
2019Unbroken Bonds
2023Crown Zenith

















See the full Gym Heroes card list
An ungraded Misty's Seel from Gym Heroes sells for about $4.11. A PSA 10 is worth more, roughly $53.43 by our estimate, and a PSA 9 around $16.44.
It is a Common, and it shows up about once every 6 Gym Heroes packs.
Atsuko Nishida drew the art for this card.
Yes, as a digital simulator. Holobrook lets you open Gym Heroes 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.