In the context of my meta, I will most frequently look to steal from aggro decks with Green that will likely be running bigger creature threats, & more versatile removal (looking mostly at you, Enchantments)
Like most Magic: The Gathering cards, the value of Filigree Familiar depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Commander Legends)
If a Dragon with flying (which is most of them) enters the battlefield under your control, both abilities will trigger
(It can't be blocked except by two or more creatures.) Madame Hydra's ability resolves before the spell that caused it to trigger
Every game you track builds a picture of which decks win, who's beating you, and how your pod really plays so the app gets more useful the more you sit down to play