This is a knockoff version of 5-12-B1 that has had the mold number removed. 2.5″ tall. Click images to enlarge.
Diamonds symbol (unicorn):
Diamonds symbol (earth pony):
Hearts symbol (earth pony):
These ones were in Kid Connection (Walmart store brand) tube package for the holiday 2020 season (they came with larger ponies in Fakie Mold 5-09-B1):
Dollar store variant (hard, glossy plastic):