Rathi Dragon is pretty high on my list. It was on the first product I ever opened (75-card Tempest pack), and was a very different, sinister take on dragons that blew my 10 year old mind. It didn't hurt that a few years later I played 2 of them in Sligh and loved the card.
Nowadays, I'm pretty into the APAC Mt Fuji by Ed Beard, and play 10 of them in Legacy Burn. Beyond that, pretty partial to anything by DiTerlizzi, Brom, Tedin, Guay, and a few other big ones from the late 90s.