The Tyranitar GX (223 / 214) card can be found in the Lost Thunder set.
Recently sold 9 times and based on those sales is worth around £25.90.
Currently, there are 8 open listings for this card on ebay.
This card sells in the range of £19.13 to £32.67, making it quite stable.
This Rare Rainbow card was illustrated by 5ban Graphics.
The fact that it is a GX card makes it one of the more valuable cards.