Mystical Teachings 
Instant
Search your library for an instant card or a card with flash, reveal it, put it into your hand, then shuffle.
Flashback 
(You may cast this card from your graveyard for its flashback cost. Then exile it.)
Legality
standardLEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL