relics/RelicLightBulb.cs
using Sandbox;
using System.Reflection.PortableExecutable;
using System.Runtime.Versioning;
using System.Threading.Tasks;

public class RelicLightBulb : Relic
{
	public override void Init()
	{
		base.Init();

		MaxLevel = 1;
	}

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

	public override async Task HandleEventAsync(EventType eventType)
	{
		var card0 = Manager.Instance.ChosenCards[0];
		var card1 = Manager.Instance.ChosenCards[1];

		var nearbyCards0 = Manager.Instance.GetNearbyCards( card0.GridPos ).Where( x => x != card1 && !x.IsRevealed ).ToList();
		var nearbyCards1 = Manager.Instance.GetNearbyCards( card1.GridPos ).Where( x => x != card0 && !x.IsRevealed && !nearbyCards0.Contains( x ) ).ToList();

		if ( nearbyCards0.Count == 0 && nearbyCards1.Count == 0 )
			return;

		Manager.Instance.PushEventMessage( this, eventType );

		Manager.Instance.PlaySfxCenter( "light_bulb", volume: 1.2f, pitch: Game.Random.Float( 1.5f, 1.55f ) );

		await Task.DelayRealtime( 500 );

		foreach ( Card card in nearbyCards0 )
		{
			Manager.Instance.PlayCardSfx( "card_flip", card, volume: 0.6f, pitch: Game.Random.Float( 1.15f, 1.2f ) );
			await Manager.Instance.RevealCard( card );
			await Task.DelayRealtime( 50 );
		}

		foreach ( Card card in nearbyCards1 )
		{
			Manager.Instance.PlayCardSfx( "card_flip", card, volume: 0.6f, pitch: Game.Random.Float( 1.15f, 1.2f ) );
			await Manager.Instance.RevealCard( card );
			await Task.DelayRealtime( 50 );
		}

		await Task.DelayRealtime( 1000 );

		foreach ( Card card in nearbyCards0 )
		{
			Manager.Instance.HideCard( card );
			Manager.Instance.PlayCardSfx( "card_flip", card, volume: 0.7f, pitch: Game.Random.Float( 0.65f, 0.75f ) );
			await Task.DelayRealtime( 50 );
		}

		foreach ( Card card in nearbyCards1 )
		{
			Manager.Instance.HideCard( card );
			Manager.Instance.PlayCardSfx( "card_flip", card, volume: 0.7f, pitch: Game.Random.Float( 0.65f, 0.75f ) );
			await Task.DelayRealtime( 50 );
		}

		await Task.DelayRealtime( 400 );

		Manager.Instance.PopEventMessage();
	}
}