Barathrum, the Spirit Breaker

Spirit breaker enters the battlefield tapped
{u}{b}{r}{t}, Spirit Breaker gains Double Strike and hexproof, have Spirit Breaker fight target
creature you don't control.
If Spirit Breaker deals comabt damage to a
creature, Roll a D20, on a 14 or higher,
that creature does not untap on its next turn.
"I'll break their spirits and their backs." Barathrum.