Liturgy of Blood

• WWizards of the Coast2013-07-01
  Official Ruling
  If the target creature is an illegal target when Liturgy of Blood tries to resolve, it won't resolve and none of its effects will happen. You won't add mana.
• WWizards of the Coast2013-07-01
  Official Ruling
  Liturgy of Blood isn't a mana ability and uses the stack. Players can respond to it by casting spells and activating abilities.

Rulings via Scryfall