this.color.setBlack(true);
// All creatures get -1/-1 until end of turn for each Swamp you control.
PermanentsOnBattlefieldCount count = new PermanentsOnBattlefieldCount(filter, -1);
ContinuousEffect effect = new BoostAllEffect(count, count, Duration.EndOfTurn, new FilterCreaturePermanent(), false, null, true);
effect.overrideRuleText(ruleText);
this.getSpellAbility().addEffect(effect);
}