I am using the high lvl plant deck sans Lord poison since I don't have Marik yet. I'm using Talaya instead and it's working fine. Though I think lord poison could do better since he can revive from graveyard, but I don't think it is absolutely necessary.
Also I'm not sure if there is another reason, but for skill I like draw fire better since Marina is the only fire and it activates at 1500.
When you have Dust Knight, you can't risk using Botanical girl, a plant searcher that misses timing, just like Machina Peacekeeper and Pinch Hopper
All you really need is Dust Knight, Tribute to the Doomed, and Rose Lover
Also, this deck is missing DNA Surgery
An obvious +1 to +2 you can get with fragrance storm