Examples of ConditionalRequirementEffect

        this.color.setRed(true);
        this.power = new MageInt(5);
        this.toughness = new MageInt(3);


        // Marauding Maulhorn attacks each combat if able unless you control a creature named Advocate of the Beast.
        Effect effect = new ConditionalRequirementEffect(
                new AttacksIfAbleSourceEffect(Duration.WhileOnBattlefield),
                new PermanentsOnTheBattlefieldCondition(filter, PermanentsOnTheBattlefieldCondition.CountType.FEWER_THAN, 1));
        effect.setText("{this} attacks each combat if able unless you control a creature named Advocate of the Beast");


        this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, effect));
        
    }

Examples of mage.abilities.decorator.ConditionalRequirementEffect

        this.addAbility(blackAbility);
        // As long as enchanted creature is green, it gets +1/+1 and all creatures able to block it do so.
        SimpleStaticAbility greenAbility;
        greenAbility = new SimpleStaticAbility(Zone.BATTLEFIELD, new ConditionalContinousEffect(new BoostEnchantedEffect(1, 1), new EnchantedCreatureColorCondition(ObjectColor.GREEN),
            "As long as enchanted creature is green, it gets +1/+1"));
        Effect effect = new ConditionalRequirementEffect(new MustBeBlockedByAllAttachedEffect(AttachmentType.AURA), new EnchantedCreatureColorCondition(ObjectColor.GREEN));
        effect.setText("and all creatures able to block it do so");
        greenAbility.addEffect(effect);
        this.addAbility(greenAbility);
    }

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