You mean why it would be in
?
Well, this is a GMC card, so I had to work with the clues given
1) I can fly.
2) I can help other creatures, thought it's not quite healing.
3) I'm not an airplane but I'm mechanical.
As Armagio, Graviton Mercenary and Graviton Salvager are the most mechanical cards and all in
it makes sense to make Zeppelin a
creature.
As for the effect, think of Zeppelin as a mobile HQ coordinating unit movements and providing air support, thus the buff. Though since zeppelins are notoriously slow and fragile perhaps it could be renamed to Helicarrier or something...