Zelda, Burgeoning Scholar

{t}: The next Artifact spell you cast this turn
costs {w}{u}{b}{r}{g} less to cast. This effect reduces
only the amount of colored mana you pay.
{6}: Target creature you control without prowess
gets prowess until end of turn. This ability costs
{1} less to activate for each tapped Artifact you
control and for each tapped Legendary Creature
you control.