This white creatures basically just Make a Stand that synergizes with cards that care about spirits, knights, and creatures in general
Nearly every set introduces a new card or two that makes Faldorn better
And in 60-card decks, this green creature has been punching up in two different formats, and across several decks
I know the card is named The Wise Mothman, but my experience is that this Mothman is angry and will attack you several times hoping to knock you out through commander damage
You want to spend the early turns putting as many bodies out on board as possible, then you want to start convoking with those creatures
You might think you'd have to stop there, but if you then use Quicksilver Elemental again to copy Vivi's effect, you're actually getting a new copy of the mana-making power, one that hasn't been used yet