Card text reads:
Adds New effect on
all of your cards
replaces a card in
hand with self
if matched card is 0
cost card stock +9
For clarity, I suggest:
Replace one card
with self.
Add New flag to
entire hand.
If matching card
is 0-cost,
Stock +9
My only question is whether it's replacing a selected card with self or a random one.
(I used
Renewal for reference in rewording the New flag application.)
Edit: It's worth noting that the system will apply the New flags by discarding and redrawing your hand, effectively showing your opponent where everything is via the discard pile in a Hidden match. Then again, it's also hiding any revealed cards, so you have that additional benefit.