Im speaking from firsthand experiencesomeone international messaged me through the Old School Discord asking me to bid on the card for them (eBays international shipping options are very expensive)
If you need to make a Synchro 10 play or you need another Level 4 to make a Rank 4 Xyz, you should do Mothman first
Heres what it does: You can discard this card from your hand to negate any effects that move cards out of the deck, be it special summons, drawing, or even sending cards from the deck to the graveyard
We see it in its spinoff games too, like Detective Pikachu, which usher Pokemon into new roles and new game styles
I remember putting together a complete set of Arabian Nights and selling it onlinepre-Ebayfora cruise to the Bahamas
While limited by only being able to activate a single effect of the card once per turn, preventing any shenanigans by activating the card in succession, it's still a powerful card that could see the occasional inclusion in Side Decks for countering decks like Snake Eyes or Fire King