Kabugi, the Furious

Bushido 4
When Kabugi, the Furious enters the battlefield, you may pay {r}. If you don't, copy target Arcane spell and you may choose new targets for the copy.
All libraries gain "At the beginning of your end step, target opponent may sacrifice a creature with both power and toughness 3 or more. If that player doesn't, add {1} to your mana pool."
{1}: Two target artifact creatures get +4/+0 (This effect doesn't end)