Shinigami's eyes

{x} can only be paid with life.
This spell can't be countered, Shroud, Protection from everything.
Shinigami's eyes enters the battlefield with {x} vision counter's, each opponent plays with {x} cards from their hand reveal, you may change
one of the revealed cards to another one of the opponent choice, they cannot reveal a card that
has been already revealed by this effect, you can
only do this once per turn, per opponent.