Breakthrough 

Sorcery
Draw four cards, then choose X cards in your hand and discard the rest.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL
Sorcery
Draw four cards, then choose X cards in your hand and discard the rest.