The Keldeo EX (142 / 149) card can be found in the Boundaries Crossed set.
Recently sold 1 times and based on those sales is worth around £7.49.
Currently, there are 8 open listings for this card on ebay.
This card sells in the range of £7.49 to £7.49, making it very stable.
This Rare Ultra card was illustrated by 5ban Graphics.
The fact that it is a EX card makes it one of the more valuable cards.