Elekarhe, The Butcherer

Trample, haste, berserk 3(At the beginning of combat, this card gains indestructible and +3 +3 until end of combat. Then, if it would be put into a graveyard, exile it instead.)
At the beginning of combat, if you control less than 7 berserkers, sacrifice Elekarhe, The Butcherer.
At the beginning of combat, if you are on 5 or less life, creatures you control lose all abilities and gain berserk 7 and trample