Every pet on my wanted list (which is three RAF, all TCGs rarer than the Hippogryph and Bananas, plus a viscious horror), for realistic. For unrealistic, all pets on my excluded list which include CEs pre-cataclysm, fettish shaman, tyrael, the remaining regional exclusive pets that weren't made RAF, and a time machine for the vampiric batling.
For mounts, realistic would be onyxia and Kael'thas being nice enough to drop their respective mounts one of these days, as well as the other rare raid drop mounts (drools over Invincible) from every raid in wrath, cata, and pandaria.Unrealistic? Spectral Tiger (this is my dream mount), time machine for the original ZG tiger, and I adore the old racial mounts before they put a ton of armor on them, so a time machine for those too. Being able to obtain the old naxx glory proto-drakes besides the BMAH would be awesome too.