Hmm, I think the upgraded version is a bit OP compared to the unupgraded one. It receives a -1 cost benefit and -2 ability cost benefit...
I would suggest the following:
Aerial Weapon
2
3
: Flow
Surreal Weapon
1
3
Flow
Take in mind that Animate Weapon merely costs 1 of a random quanta...
Furthermore, your wording needs to be reworked.
Do you mean
"This card turns into your current weapon and summon that weapon as a creature."
OR
"This card turns into your current weapon. Your weapon is destroyed."