cards/CardGenie.cs
using Sandbox;
using System.Threading.Tasks;

public class CardGenie : Card
{
	public override bool IsAlive => true;

	public override bool ShouldHandleEvent( EventType eventType )
	{
		return eventType == EventType.Match && Manager.Instance.ChosenCards[0] == this;
	}

	public override async Task HandleEventAsync( EventType eventType )
	{
		Manager.Instance.PushEventMessage( this, eventType );

		await Task.DelayRealtime( 250 );

		Manager.Instance.PlayCardSfxBetween( "genie", Manager.Instance.ChosenCards[0], Manager.Instance.ChosenCards[1], volume: 0.6f, pitch: Game.Random.Float( 1.25f, 1.26f ) );

		Manager.Instance.AddStatus( "StatusGenie" );

		await Task.DelayRealtime( 1750 );

		Manager.Instance.PopEventMessage();
	}
}

public class StatusGenie : StatusEffect
{
	public float TimerReductionAmount { get; set; }

	public override bool ShouldHandleEvent( EventType eventType )
	{
		return eventType == EventType.Choose;
	}

	public override async Task HandleEventAsync( EventType eventType )
	{
		var validCards = Manager.Instance.Cards.Where(x => x.CardType == Manager.Instance.ChosenCard.CardType && x != Manager.Instance.ChosenCard).ToList();
		if ( validCards.Count == 0 )
			return;

		Manager.Instance.PushEventMessage( this, eventType );

		await Task.DelayRealtime( 250 );

		Manager.Instance.PlayCardSfx( "genie_choose", Manager.Instance.ChosenCard, volume: 0.9f, pitch: Game.Random.Float( 0.95f, 1.05f ) );

		await Task.DelayRealtime( 750 );

		validCards.Shuffle();

		await Manager.Instance.ShakeCard( validCards.FirstOrDefault() );
		
		await Task.DelayRealtime( 750 );

		Manager.Instance.PopEventMessage();

		Manager.Instance.RemoveStatus( this );
	}

	public override string GetEventIcon( EventType eventType )
	{
		return "textures/genie.png";
	}

	public override string GetEventText( EventType eventType )
	{
		return "Shake matching card";
	}
}