Lex's Ultimate completely destroys Barik's Ultimate, so try to save it for the right time.

You can negate the seedlings damage by using obliteration, especially when fighting close to her as it will also damage her.

This matchup is extremely difficult, but try to make her waste her fire by going planted, then immediately switching to travel form. (note that you will still take much damage but it won't be an insta kill)

Always throw a Dead Zone on Planted Yagorath, as it will most likely force her to retreat.