You hate igni and scorch :) Try to hold your leader to last round! You want long last round to abuse artifact's and imlerith.
In 1 round:Use witcher's, Wild hunt Riders and worse card/cards you have in hand. Don't use more than 5 cards to win round. In 2 round:Use witcher's Wild Hunt Riders if you didn't use them 1st round, if you won 1st round use your worst cards in hand. Try to have 7 cards at the end of this round. In 3 round:Use Artifacts first and use leader on Imlerith then play him. If you don;t have him use it on last card. Beware igni and scorch.