Mayor Mare is in trouble so she activates the Squish Signal. The card's info says:
JIOJ-EN010:
Squish Signal
Normal Trap
When a "My Plump Pony Pal" monster you control is destroyed by battle and sent to the Graveyard: You can target 1 "My Plump Pony Pal" monster in your Graveyard, except the destroyed monster; Special Summon that target in face-up Defense Position.
Common