I'm confused on how the super power Phasing works. The card text says that it is +1 Power for each card in your hand.
I'm assuming that if I play it as my first card, it starts out as +4 Power but then drops as I play cards. Dropping to +0 if I play every card from my hand.
Is that correct, or is the power 'locked in' when I play it?
It's locked in when you play it.