The Forretress (3 / 90) card can be found in the Hs Undaunted set.
Recently sold 3 times and based on those sales is worth around £1.99.
Currently, there are 5 open listings for this card on ebay.
This card sells in the range of £0.29 to £3.69, making it very stable.
This Rare Holo card was illustrated by Kyoko Umemoto.