at Sitecore.Mvc.Pipelines.MvcEvents.Exception.ShowAspNetErrorMessage.ShowErrorMessage(ExceptionContext exceptionContext, ExceptionArgs args)
   at Sitecore.Mvc.Pipelines.MvcEvents.Exception.ShowAspNetErrorMessage.Process(ExceptionArgs args)
   at (Object , Object[] )
   at Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args)
   at Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain)
   at Sitecore.Mvc.Pipelines.PipelineService.RunPipeline[TArgs](String pipelineName, TArgs args)
   at Sitecore.Mvc.Filters.PipelineBasedRequestFilter.OnException(ExceptionContext exceptionContext)
   at System.Web.Mvc.ControllerActionInvoker.InvokeExceptionFilters(ControllerContext controllerContext, IList`1 filters, Exception exception)
   at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)
   at System.Web.Mvc.Controller.ExecuteCore()
   at System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext)
   at Sitecore.Mvc.Controllers.ControllerRunner.ExecuteController(Controller controller)
   at Sitecore.Mvc.Controllers.ControllerRunner.Execute()
   at Sitecore.Mvc.Presentation.ControllerRenderer.Render(TextWriter writer)
   at Sitecore.Mvc.Pipelines.Response.RenderRendering.ExecuteRenderer.Render(Renderer renderer, TextWriter writer, RenderRenderingArgs args)

using PROJECTABC.Feature.Composites.SXA.Repositories;
using Sitecore.XA.Foundation.RenderingVariants.Controllers;

namespace PROJECTABC.Feature.Composites.SXA.Controllers
{
    public class DCardsController : VariantsController
    {
        protected readonly IDCardsRepository DCardsRepository;

        public DCardsController(IDCardsRepository dCardsRepository)
        {
            DCardsRepository = dCardsRepository;
        }

        protected override object GetModel()
        {
            return DCardsRepository.GetModel();
        }
    }
}

using Sitecore.XA.Foundation.Variants.Abstractions.Models;

namespace PROJECTABC.Feature.Composites.SXA.Models
{
    public class DCardsModel : VariantsRenderingModel
    {
        public string CustomProperty { get; set; }
    }
}

using PROJECTABC.Feature.Composites.SXA.Models;
using Sitecore.XA.Foundation.Mvc.Repositories.Base;
using Sitecore.XA.Foundation.RenderingVariants.Repositories;

namespace PROJECTABC.Feature.Composites.SXA.Repositories
{
    public class DCardsRepository : VariantsRepository, IDCardsRepository
    {
        public override IRenderingModelBase GetModel()
        {
            DCardsModel model = new DCardsModel();
            FillBaseProperties(model);
            model.CustomProperty = "This is just an example rendering";
            return model;
        }
    }
}

using Sitecore.XA.Foundation.Mvc.Repositories.Base;

namespace PROJECTABC.Feature.Composites.SXA.Repositories
{
    public interface IDCardsRepository : IModelRepository
    {
    }
}

using Sitecore.XA.Foundation.Mvc.Repositories.Base;

namespace PROJECTABC.Feature.Composites.SXA.Repositories
{
    public interface IDCardsRepository : IModelRepository
    {
    }
}

using Microsoft.Extensions.DependencyInjection;
using PROJECTABC.Feature.Composites.SXA.Controllers;
using PROJECTABC.Feature.Composites.SXA.Repositories;
using Sitecore.DependencyInjection;

namespace PROJECTABC.Feature.Composites.SXA
{
    public class RegisterDependencies : IServicesConfigurator
    {
        public void Configure(IServiceCollection serviceCollection)
        {
            serviceCollection.AddTransient<IDCardsRepository, DCardsRepository>();
            serviceCollection.AddTransient<DCardsController>();
        }
    }
}

/sitecore/templates/Feature/DCards

/sitecore/system/Settings/Feature

/sitecore/layout/Renderings/Feature/DCards/DCard Content

/sitecore/content/Government/PROJECTABC/MyTaxPortal/Data/DCards/Card1

/sitecore/content/Government/PROJECTABC/MyTaxPortal/Presentation/Available Renderings/DCards

/sitecore/content/Government/PROJECTABC/MyTaxPortal/Presentation/Rendering Variants/DCards