Rulings

• 2015-02-25
  If you choose to cast the exiled card and it has in its mana cost, you must choose 0 as its value.
• 2015-02-25
  If you cast a card "without paying its mana cost," you can't pay alternative costs. You can pay additional costs. If the card has mandatory additional costs, you must pay those.
• 2015-02-25
  When casting a card with Living Lore's last ability, ignore timing restrictions based on the card's type. Other timing restrictions, such as "Cast [this spell] only during combat," must be followed.
• 2015-02-25
  Living Lore's last ability will trigger whenever it deals combat damage, no matter if that damage is dealt to an opponent, an opposing planeswalker, or a creature it's blocking or being blocked by. You choose whether to sacrifice Living Lore as that ability resolves.
• 2015-02-25
  Similarly, if the exiled card somehow leaves exile while Living Lore is on the battlefield, it will become a 0/0 creature and be put into its owner's graveyard (unless something else is raising its toughness).
• 2015-02-25
  If Living Lore leaves the battlefield, the ability that defines its power and toughness will lose track of the exiled card. Its power and toughness are 0 in other zones.
• 2015-02-25
  If there are no instant or sorcery cards in your graveyard as Living Lore enters the battlefield, it will enter the battlefield as a 0/0 creature and be put into its owner's graveyard due to having 0 toughness.