Venerated Grand-Wizard

Fealty (As you cast this card and during your
upkeep, you may have any number of creatures you control swear fealty to it by tapping them.)
{u}{u}, {t}: Copy target instant or sorcery card in
your graveyard X times, where X is the number
of nontoken creatures that swore fealty to
Venerated Grand-Wizard this turn. You may
choose new targets for the copies. Exile the
copied card.