Afraid, Arcanist

Afraid's power is equal to the number of instant
or sorcery cards in opponents' graveyards.
{t}{x}{x}{u/b}{u/b}{b}: Target player mills cards until
they mill X instant or sorcery cards.
{u}{u}{2}: Exile target instant or sorcery card from
a graveyard. You may cast that spell this turn, and
you may spend mana as though it were mana of
any type to cast that spell.