Instant
Demonstrate
(When
you
cast
this
spell,
you
may
copy
it.
If
you
do,
choose
an
opponent
to
also
copy
it.
Players
may
choose
new
targets
for
their
copies.)
Destroy
target
artifact
or
creature
you
don't
control.
If
that
permanent
is
destroyed
this
way,
its
controller
exiles
cards
from
the
top
of
their
library
until
they
exile
a
nonland
card,
then
they
may
cast
that
card
without
paying
its
mana
cost.
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