US release ponies - the 2nd group of twinkle-eyes (the one that includes Mimic) are often HTF; the same goes for the second group of twice-as-fancy ponies... the Big Brother ponies, certain So-Soft ponies (like Crumpet and Angel)... oh gosh, there are a bunch
Also, if you're wondering about baiting a G1, you can always post it here - we're more than happy to help identify and let you know if it's a rare one!