The Entei (SL3) card can be found in the Call of Legends set.
Recently sold 2 times and based on those sales is worth around £25.67.
Currently, there are 3 open listings for this card on ebay.
This card sells in the range of £15.96 to £35.38, making it quite stable.
This Rare Holo card was illustrated by Yuri Umemura.