Mark of Multiplicity

The "Legend Rule"doesn't apply to Mark.

{w}{u}{b}{r}{g}, {t}: Create a copy of this card for each creature named Mark of Multiplicity.

{t}: Sacrifice Mark of Multiplicity: The next spell you cast costs {x} less to cast, where X is the number of creatures named Mark of Multiplicity.

"Oh hi Mark. Wait, why are there two?"