The reason it taps the enchanted creature is probably because the Standard-legal Storm Herald would abuse it otherwise. (That thing also already abuses Eldrazi Conscription in Modern FWIW.)
The tap clause is a nice way for your opponent to react and not get blown out by whatever evasive creature this is bound to land on. I feel the cat art is better than the....caterpillar?
A goat, huh? How about a squirrel? We're getting one in this set, right?
*Insert Emrakul = 15 squirrels meme*
Yes, I'm aware of ways to untap creatures, I was more meaning for limited.
Creepy or not I'm just not sure what that is in the promo version of the art. I personally don't find it creepy.
Better hope you kill them. lol