Sigarda's Vanguard 
Creature — Angel
Flash Flying Whenever this creature enters or attacks, choose any number of creatures with different powers. Those creatures gain double strike until end of turn.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL