Not only does this creature buff all your other dragons with a global +1/+1, but thanks to its storm ability, you can end up with a sudden army of flying beaters if you chain a few spells together
In total, this card requires five colorless energies to use its special attack, which isn't bad at all
Flygon's first move is called Reactive Blast and only takes 2 energy cards, 1 colorless, 1 electric and does 40+ damage depending on if you want to discard any react energy cards from Flygon while you perform the move, so in essence, Reactive Blast can do 100 damage for 2 energy cards, if both your energy cards attached to Flygon are react energy cards
It can be challenging to play a card like Chalice of the Void on 1 without also hindering your own play, but its not unheard of
However, in this case, you need to consider security measures since the cards cost thousands of dollars, and you don't know what will be in a person's mind