Phyrexian Mutation

You can pay 2 life instead of {w} for the
spells you cast. It's the same for the {u}, {b}, {r}, {g} and {c} in the spells you cast.
In Mirrodin, the Phyrexians found a way to
turn life into death, beauty into horror and
abundance into void.
—Venser the Sojourner