Haste (This creature can attack, and as soon as it comes under your control.)
Ghazghkull, Prophet of the Waaagh! attacks each combat if able.
Ghazghkull, Prophet of the Waaagh! has
indestructible (Effects that say "destroy" don't destroy that permanent. An indestructible creature can't be destroyed by damage.) as long as it's your turn.
Whenever a creature dealt damage by Ghazghkull, Prophet of the Waaagh! this turn dies, put a +1/+1 counter on Ghazghkull, Prophet of the Waaagh!.