Hello there!
I am sorry to ask out of my owen stupitidy, but i dont get how to beat Liv.
The best way is to use deck with mostly lightning cards and buff their damage - cards like 6 of sluts and 3 of sluts. Items like ring and stuff from secret shop are also helpful. Frost cards are also ok to run just for some extra turns or for synergy with the item that buffs damage of lightning cards when target has chill charges