class TransformEffect extends ContinuousEffectImpl {

    TransformEffect() {
        super(Duration.WhileOnBattlefield, Layer.TransformEffects_1, SubLayer.CopyEffects_1a, Outcome.BecomeCreature);
        staticText = "";
    }

    private TransformEffect(final TransformEffect effect) {
        super(effect);
    }

    @Override
    public boolean apply(Game game, Ability source) {
        Permanent permanent = game.getPermanent(source.getSourceId());
        if (permanent == null) {
            return false;
        }

        // only for transformed permanents
        if (!permanent.isTransformed()) {
            return false;
        }

        return TransformAbility.transformPermanent(permanent, game, source);
    }
...

public synchronized void apply(Game game) {
        removeInactiveEffects(game);
        List<ContinuousEffect> activeLayerEffects = getLayeredEffects(game); // main call

        List<ContinuousEffect> layer = filterLayeredEffects(activeLayerEffects, Layer.CopyEffects_1);
        for (ContinuousEffect effect : layer) {
            Set<Ability> abilities = layeredEffects.getAbility(effect.getId());
            for (Ability ability : abilities) {
                effect.apply(Layer.CopyEffects_1, SubLayer.CopyEffects_1a, ability, game);
            }
        }
        for (ContinuousEffect effect : layer) {
            Set<Ability> abilities = layeredEffects.getAbility(effect.getId());
            for (Ability ability : abilities) {
                effect.apply(Layer.CopyEffects_1, SubLayer.FaceDownEffects_1b, ability, game);
            }
        }
        //Reload layerEffect if copy effects were applied
        if (!layer.isEmpty()) {
            activeLayerEffects = getLayeredEffects(game, "layer_1");
        }
...

public static boolean transformPermanent(Permanent permanent, Game game, Ability source) {
    
...

    for (Ability ability : sourceCard.getAbilities()) {
        // source == null -- call from init card (e.g. own abilities)
        // source != null -- from apply effect
        permanent.addAbility(ability, source == null ? permanent.getId() : source.getSourceId(), game, true);
    }

...

}