Knight of the Mists

Knight of the Mists

Creature - Human Knight | Power/Toughness: 2 / 2 (CMC 3)
Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)
When Knight of the Mists enters the battlefield, you may pay . If you don't, destroy target Knight and it can't be regenerated.