While using the alliance ability with devilish valet at the end of turn his power is decreasing to 0 instead if his base power which is .Further prohibiting you from using alliance ability later in the match without casting another copy or buffing his power.
Hello @DemonGazer201 ,
Thank you for all the information provided, this issue will be investigated!
If you have any additional information that you consider relevant, please don’t hesitate to send me 
Rebeca.
When I used the conquer pledge, the vallet at the beginning of the next turn not only had a 0 displayed, when looking at its stats, it read -280.