Prophet of Toth

When Prophet of Toth enters the battlefield, you
may look at the top 4 cards of your library. Put
an Instant or Sorcery card revealed this way into
your hand and the rest on the bottom of your
library.
Cycling {u} ({u}, Discard this card: Draw a card)
When you Cycle an Instant or Sorcery, you may
Exile it. You may cast it until the end of your
next turn.