Nightbird's Clutches 
Sorcery
Up to two target creatures can't block this turn.
Flashback 
(You may cast this card from your graveyard for its flashback cost. Then exile it.)
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL