Krothk the Harsh

When Krothk enters the battlefield, search your library for a legendary red equipment card
named Krothk's Whip, and put it onto the battlefield attached to Krothk.
Krothk can't attack.
Whenever Krothk deals damage to an opponent,
tap target nonland permanent that player
controls. That permanent doesn't untap during
its controler's untap step.