And it's not like it doesn't matter to someone about all sorts of silly minor holidays; I'm still surprised...
Regarding the underpowered nature of the ghosts' ability – if it's classic 100% vampirism, then, on the contrary, for a low-tier unit, it's very, very strong; it's a no-brainer way to attack without losses. In general, the undead seem to be a faction that can very easily replenish its numbers, and they roll over neutrals like a steamroller, especially if they also have classic undead abilities; we'll see if they get banned in PvP.
Vampires should have been given one upgrade as pure animals, like the wyverns from the fifth game.

And besides the meme, the idea is cool, but it's unlikely to work; 146% of the time, upgrades are just retextures with a couple of trinkets and the same skeleton and set of animations; making one upgrade in one part special and unlike anything else is just not a good idea. Unless the entire unit is reworked in this spirit. I would be interested in seeing that.
🏹🎪+⛓️♿=💕