Filli-Second has her own designated zone but she's probably not as fast as she once was. Here's the card's info:
JIOJ-EN003:
Plump Power Pony Perimeter
Field Spell
"My Plump Pony Pal" Synchro Monsters cannot be destroyed by battle. At the start of the Damage Step, if a "My Plump Pony Pal" Synchro Monster you control battles: Destroy the other monster.
Super Rare