Serra's Guardian 
Creature — Angel
Flying (This creature can't be blocked except by creatures with flying or reach.) Vigilance (Attacking doesn't cause this creature to tap.) Other creatures you control have vigilance.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL