Octavia playing a belly beat. The card's info says:
Big Beats
Normal Trap
When you control "My Plump Pony Pal Octavia" and/or "My Plump Pony Pal Vinyl Scratch: Apply this effect.
● "My Plump Pony Pal Vinyl Scratch": Change all monsters on the field to Defense Position.
● "My Plump Pony Pal Octavia": Special Summon 2 "Music Tokens" (EARTH/Music-Type/Level 2/ATK 0/DEF 0). You can Tribute 1 "Music Token" you control, then target 1 "My Plump Pony Pal Octavia" or "My Plump Pony Pal Vinyl Scratch" you control; it gains 500 DEF.
● Both cards: Your opponent cannot Set cards this turn.
Super Rare