Like most Magic: The Gathering cards, the value of Burgeoning 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 2016)
It can do great work in Commander, where you have time to really leverage this classs final level
With cards like Genesis Hydra and Nykthos to pair with her land untapping, the seeds are sown for a big mana list
This might not be entirely applicable to MTG, but its a fact that foil cards or those with special art are much more valuable than their regular counterparts
You can pay additional costs, such as kicker costs
Reactivity doesnt necessarily mean preparation: you can frame it as opportunistic, in the way that more villains should just be shot while monologuing