Teroh's Vanguard 
Creature — Human Nomad
Flash Threshold — As long as seven or more cards are in your graveyard, this creature has "When this creature enters, creatures you control gain protection from black until end of turn."
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL