Artifact
At
the
beginning
of
each
upkeep,
each
player
exiles
the
top
card
of
their
library.
The
player
who
exiled
the
card
with
the
greatest
mana
value
takes
an
extra
turn
after
this
one.
If
two
or
more
players'
cards
are
tied
for
greatest,
the
tied
players
repeat
this
process
until
the
tie
is
broken.
