Why it worked
The post leverages a popular collectible toy trend (squishies) and ties it to a local sports team (St. Louis Cardinals) and a specific event (Kids Sunday at Busch Stadium), creating a sense of urgency and exclusivity with the "mystery" and "rare chase" elements.
Summary
This is a promotional image for a "Mystery Squishy Dumpling" event at Busch Stadium, featuring 4 Cardinals-themed dumplings. The event is for 10,000 kids aged 15 and under, and there's a "rare chase" variant.