Pondering Soldier

Exorcism — Whenever the creature attacks,
if there are no cards in your graveyard and
you control no black permanents, you draw
a card and gain 3 life.
{t}, {w/u}{w/u}, Discard a card: Exile all cards from
your graveyard.
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"She doesn't do much on the battlefield, but she's
a trusty healer, and always positive."