Kazuma, Panicked Adventurer

As Kazuma, enters the battlefield exile an instant or sorcery from your hand.
{4}{t}: Copy the exiled card. You may cast it without paying its mana cost.
{2}{t}: Copy target activated ability and choose a new target. Resolve this copy last. Kazuma doesn't untap during your next untap step.
"Yes, I'm Kazuma."