May I cast Grave Birthing, Cremate or Purify the Grave in response to the opponent targeting an instant or sorcery with converted mana cost 3 or less from the graveyard spell with Goblin Dark-Dwellers in order to exile it (so the opponent can't cast it and he can't choose another spell in graveyard)?
May I cast Grave Birthing, Cremate or Purify the Grave in response to the opponent targeting an instant or sorcery with converted mana cost 3 or less from the graveyard spell with Goblin Dark-Dwellers in order to exile it (so the opponent can't cast it and he can't choose another spell in graveyard)?
Thanks.