Death Note

Equipped creature has: "{b}{b}, {t}: Destroy target creature. It can't be regenerated." and "Whenever
Death Note becomes unequipped from this creature,
its owner exiles the top 10 cards of their library."

Pay half your life, rounded up: Equipped creature
gains "Your opponents play with their hands
revealed." for as long as Death Note remains
equipped to that creature.

Equip {0}