Duergar Taskmaster

Defender, Reach, Shelter 2, Wither
Whenever a creature would die as a result of combat damage done by a duergar card, untap target duergar artifact or summon a 1/1 Duergar Slave with shelter 2
Pay 2 life or {b}{b}: Target creature gets +2/+0 until end of turn. Activate only once.