Azateth, ScorchVain

Flying
Whenever Azateth, ScorchVain deals combat damage to a player, untap all creatures you control. You get an additional combat phase this turn. Azateth, ScorchVain can't attack more than once each turn.
Whenever Azateth, ScorchVain causes a creature to die, target player loses life equal to the number of creatures that died this turn.