Cilver Crescent, [FINISHER]
3x Base Blind.
"Cards you discard will be put at the 10th position of the deck."
(I.E.. discard a 5 and 6.
The 5 becomes the 10th card in deck and the 6 becomes the 11th)
or, for something more in-line with the other bosses, while being fun IMO is;
Cyan Crescent [FINISHER]
2x Base Blind.
"Blind size increases by 0.5X base blind size after hand is played."