Serie, the Living Grimoire

Hexproof.
Whenever you cast an instant or sorcery spell, you
may copy that spell. When you copy a spell, you
may choose an opponent and give them the copied
spell. They may cast it until the end of their turn.
You and permanents you control can't be targeted.
Instant and sorcery cards in target graveyard can be
cast for its original cost plus {x}, where {x} is double
the number of times it's been cast from the
graveyard (1 = 2, 2 = 4). Mana of any color can be
used to cast it.