鲜血占卦

Text:

Rulings:

• 7/13/2018 You must sacrifice exactly one creature to cast Blood Divination; you can’t cast it without sacrificing a creature, and you can’t sacrifice additional creatures.
• 7/13/2018 Players can respond only after Blood Divination has been cast and all its costs have been paid. No one can try to destroy the creature you sacrificed to prevent you from casting this spell.