Like maotd said, you need Vervain or Roman to enable a transform team with Cattleya or Wheat as the damage dealer. Angraecum is optional. Roman works better with Angraecum for what I have used her for. Then you just your best Skill Damage increasers and memories you can with the damage dealer.
I need to get 75 more gems together and Ill make a run for Sigillaria. Definitely will find use on hard maps for her. Seems like she's a badass version of Aoenium . Easter girls are going to be out of the question this year