Instant — Lesson
Exile
cards
from
the
top
of
your
library
until
you
exile
a
nonland
card.
You
may
cast
that
card
without
paying
its
mana
cost
if
the
spell's
mana
value
is
less
than
the
number
of
Mountains
you
control.
If
you
don't
cast
that
card
this
way,
put
it
into
your
hand.
Flashback
(You
may
cast
this
card
from
your
graveyard
for
its
flashback
cost.
Then
exile
it.)
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