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.
Flanking (Whenever a creature without flanking is assigned to block this creature, the blocking creature gets -1/-1 until end of turn.)
When Knight of the Mists comes into play, pay or bury target Knight.
Fear the mists, for they are armed.
