"B", Mystic Mastermind

Whenever you cast an instant or sorcery spell,
"B", Mystic Mastermind deals 2 damage to
any target.

{1}{u}{r/g}{t}: Exile the top card of your library.
You may cast that card until the end of turn. If it's
an instant or sorcery card, it costs {1} less to cast.

Whenever you cast a spell from exile, draw a card.

"Each spell unravels the cosmos."