Instant
Counter
target
spell.
Clash
with
an
opponent.
If
you
win,
at
the
beginning
of
your
next
main
phase,
you
may
add
an
amount
of
equal
to
that
spell's
mana
value.
(Each
clashing
player
reveals
the
top
card
of
their
library,
then
puts
that
card
on
their
choice
of
the
top
or
bottom.
A
player
wins
if
their
card
had
a
greater
mana
value.)