A new OC is willing to try said formula out. The card's info says:
Super Weight Gain Formula
“My Chubbier Pony” and “My Chubbiest Pony” monsters are unaffected by card effects your opponent controls that target them.
Ultra Rare/Ultimate Rare
2 years, 8 months ago
24 Jun 2016 02:05 CEST
Full Size: 886bc633503a0fa74de6cec389ccdc7a