Legendary Artifact Creature — Golem
Karn's
power
and
toughness
are
each
equal
to
the
greatest
mana
value
among
artifacts
you
control.
At
the
beginning
of
your
upkeep,
add
for
each
artifact
you
control.
This
mana
can't
be
spent
to
cast
nonartifact
spells.
Until
end
of
turn,
you
don't
lose
this
mana
as
steps
and
phases
end.
* / *
extendedart
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