Yukihana Lamy

If an instant or sorcery card would be put into a
graveyard from anywhere, and it wasn't cast,
exile it instead. You may cast that card for as
long as it remains exiled, and mana of any type
can be spent to cast it.
{1}, Discard an instant or sorcery: Mill 3, then
draw a card. Any player may activate this ability.
{b}: Target player mills 1.