Shadow of Doubt
Instant
( can be paid with either 
or 
.)
Players can't search libraries this turn.
Draw a card.
"Your ignorance is my bliss." —Szadek
Greg Staples
Rulings
If an effect says "Search your library . . . then shuffle your library," you shuffle you libraries even though you can't search.
(wotc • 2005-10-01)
If an effect says "You may search your library . . . If you do, shuffle your library" or "You may search your library . . . then shuffle your library," you can't choose to search, so you won't shuffle.
(wotc • 2005-10-01)
Effects that instruct you to reveal or look at cards from the top of you library will still work. Only effects that use the word "search" are affected.
(wotc • 2005-10-01)
Rulings
If an effect says "Search your library . . . then shuffle your library," you shuffle you libraries even though you can't search.
(wotc • 2005-10-01)
If an effect says "You may search your library . . . If you do, shuffle your library" or "You may search your library . . . then shuffle your library," you can't choose to search, so you won't shuffle.
(wotc • 2005-10-01)
Effects that instruct you to reveal or look at cards from the top of you library will still work. Only effects that use the word "search" are affected.
(wotc • 2005-10-01)