Aaravos, the Fallen Star

Prowess, Vigilance

Whenever you cast an Instant or Sorcery spell,
you may gain 1 life and draw a card.

As long as you have cast 5 or more Instants and/or Sorceries this turn, you may cast Instant and Sorcery spells from your hand without paying their mana costs by paying an amount of life equal to the spell's mana value.