Eldritch Archmage

Whenever you draw your second card each turn, exile the top card of your library. You may cast that card until the end of your next turn.
{u}{r}{3}{t}: Roll a d20.
1-9 | You may copy one instant or sorcery spells you cast this turn.
10-19 | You may copy one instant or sorcery spells
you cast this turn.
20 | You may copy all instant or sorcery spells you cast this turn.