Zaldros' War Drum

Hexproof
Cast this spell only if you control one or more creatures with Flanking or Wither
{4}{w}{b}{r}{t} Sacrifice Zaldros' War Drum:
whenever a creature with Flanking or Wither you control deals combat damage to a permanent
or a player this turn, destroy target nonland permanent an opponent controls, it cannot be regenerated.
This activated ability cannot be countered.