// {1}, Remove a +1/+1 counter from Golgari Grave-Troll: Regenerate Golgari Grave-Troll.
Ability ability = new SimpleActivatedAbility(Zone.BATTLEFIELD, new RegenerateSourceEffect(), new ManaCostsImpl("{1}"));
ability.addCost(new RemoveCountersSourceCost(CounterType.P1P1.createInstance()));
this.addAbility(ability);
// Dredge 6
this.addAbility(new DredgeAbility(6));
}