The Shinigami Eyes

The Shinigami Eyes cannot be equipped unless
you have a Kira or Shinigami on the battlefield.
Whenever a Kira enters the battlefield you can
equip The Shinigami Eyes without a cost to a
target Kira creature.
Equipped creature have "{t},{b}: Reduce target
non-artifact creature toughness by 2." and -X
toughness where X = creature toughness -2.
Equip {5}