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
I worry that it may rely a bit too much on cards with a very high mana value, which can be a risk if your opponents play lots of counterspells and removal spells, but its hard to tell how itll actually work before having a chance to play it
It can do great work in Commander, where you have time to really leverage this classs final level
Reactivity doesnt necessarily mean preparation: you can frame it as opportunistic, in the way that more villains should just be shot while monologuing
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)