Angry soul dreadmage

, Poison,flying, landfall,
Angry soul dreadmages power and toughness is 10x z amount of all the creatures in all the graveyards.when ever a land enter the battle field all the creature you don’t control gets -3-3 counters.whenever a creature your opponents control enters the battle field it has whenever a creature enters the battle field all the other creatures they control gets -3-3 counters this ability can trigger more then once a turn.