Like most Magic: The Gathering cards, the value of Vigor 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 (Fallout)
2) Vampiric Tutor You lose two life, you don't get the card right away, and you garner card disadvantage
That being said, it's still vulnerable to a lot of removal even with the ability to give it indestructible
Domris Ambush isnt your typical removal spell
Other than that, you have the Eldrazi Titans which are always expensive
With it, you can poison your opponent's Active Pokemon, but if Brute Bonnet has the Future Energy Boost Capsule attached to it, you can also poison your own Active Pokemon