Eradicator Valkyrie 
Creature — Angel Berserker
Flying, lifelink, hexproof from planeswalkers
Boast — 
, Sacrifice a creature: Each opponent sacrifices a creature or planeswalker. (Activate only if this creature attacked this turn and only once each turn.)
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL