Limit princess/onslaught to 2. Possibly share.
Do something about the "only use backrow and stall till deckout/lockout" gameplay which is next lvl unhealthy and too easy. Possibly make some of the traps share and put a bigger limit on the extra extra skill.
Limit rose lover to 2 for sylvans by making it share with an important sylvan card so that it doesnt harm non-sylvan decks that use rose lover.
This question is waiting for your answer. Look forward to your kind help!