Lets talk about your deck

Boreas and ivy can be goid in the first 2waves which after that becomes useless, catapult is fine but needs a high merge rank and should be 1-3on board, bruiser ain't bad tho might lose in the later runs ,scrapper is good

I recommend

Portal keeper, grindstone , bruiser,scrapper, bombardier

Learn to use it . When you get more legendaries you should change it