Looks like she's having a good time at the party. Look for this artwork on the actual card uploaded on deviantART. Card info:
My Little Pony Party Cake
LIGHT/25th Anniversary Pony/4/ATK 1600/DEF 1200
This card gains 500 ATK for every 25th Anniversary Pony-Type monster you control. If this card battles a monster while you control another 25th Anniversary Pony-Type monster, destroy it without applying Damage Calculation. Halve the ATK of this card if it battles a monster your opponent controls.
Super Rare