Nefarox, Overlord of Grixis

Nefarox, Overlord of Grixis

Legendary Creature - Demon | Power/Toughness: 5 / 5 (CMC 6)
Flying
Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)
Whenever Nefarox, Overlord of Grixis attacks alone, defending player sacrifices a creature.