Yuth, Gromwel's Chosen

Prowess
When Yuth, Gromwel's Chosen enters the battlefield, if you cast it from your hand, look at
the top four of your library. You may reveal an instant or sorcery card from among them and put
it into your hand. Put the rest on the bottom of
your library in any order.
Instant and sorcery spells you cast cost {1} less to
cast.