Hsien-ko, Weapons Master

Whenever Hsien-ko attacks, you may pay {x}. If you
do, reveal cards from the top of your library until
you reveal Equipment cards with a total mana value
of X. Put those cards on the battlefield attached to
Hsien-ko, and the rest on the bottom of your
library. Then, at the beginning of your next end
step, shuffle all Equipments attached to Hsien-ko
into your library, and you gain 1 life for each card
you shuffle this way.