Lashknife Barrier 
Enchantment
When this enchantment enters, draw a card. If a source would deal damage to a creature you control, it deals that much damage minus 1 to that creature instead.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL