I am an advocate for any Poison type hybrids, especially after that atrocity called Garbodor. I mean, it's literally garbage. They owe us some amazing poison types, and they might deliver if the rumors of Poison hitting Fairies SE is true. Personally, I'd like to see Poison/Steel, Poison/Fire and maybe Poison/Electric... Woops... 4x ground weak on every single one... We're gonna need some Levitate action in here. Poison/Dragon would be an outrageous fairy killer. You are talking as if lower tiers are not viable metagames. NU may be definitive of pokemon not viable in OU, but that is really not relevant. The addition of Pokemon not viable in OU does not weaken the overall quality of the OU tier... these things are just about balance. For example, lower tiers let players use more pokemon that they ACTUALLY like, rather than just what is good. Zangoose is not what you might consider OU viable, but I love his design and he happens to work quite well in lower tiers.