If youre playing a green deck and have enough green cards to support Force of Vigor (around 16 others at minimum), the card should be almost a must-have in your sideboard which makes it a top tier candidate for the best sideboard options green decks can choose from
Even then, I will always entertain arguments for running modal pieces, such as if youre using Sunforger
Well, you'll either need to collect the cards from Arena booster packs for the sets they came in, or else directly 'craft' the specific cards you need using MTG Arena Wildcards - effectively tokens you can exchange for the exact Common, Uncommon, Rare, or Mythic Rare card you want, depending on the type of Wildcard
It is just such an impactful card , able to disrupt or shut down entire strategies, and it is great against a plethora of decks in the current format