juvenescent : becoming youthful
tonitrophobia : fear of thunder

(Retruning a creature to childhood -> putting on top of deck. And big scary thunder dragon. Or, well, rounded kyoot one at least.)

The likelihood of something surviving the 5 damage this deals aren't that high on its own.

Technically, this returns Storm Crow to the top of library, since it's a replacement effect, and not a 'when' trigger.

that's funny, why not make it a 20/5 then, just because you can lol

Because it might not be blocked? This is mighty enough that the opponent will want to block it, but not "No flier? you lose" power.

It is indeed pretty much a blue deathtouch. That's intentional.

Oops I didn't realize it had flying

my iq is approx. 12