For me, I absolutely LOVE Arturo Fuente. Especially the Anejos'. So anything rare by them, like the Del Siglo, the Opus X's, etc...is always on an implied wish list...lol But I have always wanted a Cuban Cohiba Behike as well as other in the Cuban Cohiba Lines. Love the Monte #2. Some Liga Privada lines...while available...are not really available if you know what I mean...lol
Some other unicorns (no longer made) would be the Camacho SLR's (both maduro and the habano) the original Camacho Corojo blends...and you know what...the Humo Jaguars were delightful and are not seen anymore...One more would have to be the Padilla Miami Edicion Especial 2010 Perfecto. A cigar I was crazy for back then and cannot be found now.