Brights Brightly is easing into her hammock, which can be tough for a pony her size and the way she's getting into it but it appears she's more-or-less in it. Card info:
My Chubbiest Pony Brights Brightly
LIGHT/Synchro/7/ATK 0/DEF 2800
1 Tuner + 1 or more non-Tuner monsters
This card cannot be destroyed by battle (with Damage Calculation). If this Attack Position card is attacked,  you can have the attacking monster’s ATK equal this card’s ATK and have another “My Chubbier Pony” or “My Chubbiest Pony” monster you control gain that amount until the End Phase.
Random
Ultra Rare/Ultimate Rare