A mystery pony is wearing the armor and there are few clues as to whom it is. The card's info says:
Pony in Sparkling Armor
After activation, treat this card as an Equip Card to a “My Little Pony” monster you control. It cannot be destroyed by battle (with Damage Calculation) and if it battles a Warrior or Spellcaster-Type monster, destroy that monster after Damage Calculation.
2 years, 1 month ago
27 Jun 2016 02:51 CEST
Full Size: f3c16cc38f8709f8b4e4d81b05233f2b