That seems a good solution.
Resemble Shape (Su):
A topiary plant can imitate the appearance of any creature it has eaten. The topiary plant need not have killed the creature itself, but if the creature has been dead for more than two weeks it is too decayed for the plant to mimic its living appearance. This works like the disguise self spell, except the topiary plant retains its original size and can resemble any living creature. The topiary plant's appearance retains vegetative features (vine-like fingers, thorny hair, a greenish complexion, et cetera), so it only gains a +4 bonus to Disguise checks when using this ability to disguise itself.
An advanced topiary plant can use resemble shape to give itself an additional secondary attack for every 2 hit dice it gains (e.g. 1 secondary attack at 5-6 HD, 2 at 7-8 HD and 3 at 9 HD). These attacks can be any natural weapon possessed by a creature the topiary plant has eaten, but the attack always does 1d4 damage, or 1d6 for a Large topiary plant.
Yes, I prefer the Advanced section as well.
As usual, I don't care for Iron Will. You like all creatures to be mentally-fortified powerhouses, don't you?![]()
If we give it a save-booster, I'd prefer Lighnting Reflexes. However, I'd actually prefer Improved Initiative or Weapon Focus to either of those.
Admit it. You've got Iron Will posters on your bedroom wall, and once followed them on their Epic Will tour. Didn't ya?![]()
http://www.enworld.org/forum/5304062-post14.htmlShapechanger subtype?
Environment: Any forests?
Organization: Solitary or garden (2-x)?
Challenge Rating: 2?
Treasure: None?
Alignment: Always neutral?
Advancement: x
A typical topiary plant is about x feet tall/x feet in diameter. The plant weighs x pounds.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.