Satanic Conjuring

Starting with you, each player writes down a
nonland card name, then reveals them at the
same time. Each player then conjures a duplicate
of each of the written cards into their hand.
Those duplicates gain, "You may spend mana
as though it were mana of any color to cast this
spell."
Though a demon's bargain is never fair, the allure of
the power they can grant lead many to parlance
nonetheless