Hey there!
i have a doubt about new green spoiled card "Scale Up":

"G Sorcery
Until end of turn, target creature you control becomes a green Wurm with base power and toughness 6/4."

Well, I'll explain my scenario:

Main phase, glistener elf on board
Cast Scale up on him
Oppo cast Bolt in response
Cast Invigorate in response
Invi resolves (elf become 5/5)
Scale up resolves--->which will be final pow/tough?

Greetings