The Terrakion (151 / 149) card can be found in the Boundaries Crossed set.
Recently sold 2 times and based on those sales is worth around £24.74.
Currently, there are 11 open listings for this card on ebay.
This card sells in the range of £17.60 to £31.88, making it quite stable.
This Rare Secret card was illustrated by 5ban Graphics.