cards/CardBank.cs
using Sandbox;
using System.Net;
using System.Threading.Tasks;

public class CardBank : Card
{
	public override bool ShouldHandleEvent( EventType eventType )
	{
		switch ( eventType )
		{
			case EventType.Match:
				return Manager.Instance.ChosenCards[1] == this;
		}

		return false;
	}

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

		await Task.DelayRealtime( 150 );

		var coins = Manager.Instance.Cards.Where( x => x.CardType == CardType.Coin ).ToList();
		if(coins.Count > 0)
		{
			Manager.Instance.PlayCardSfxBetween( "bank", Manager.Instance.ChosenCards[0], Manager.Instance.ChosenCards[1], volume: 1f, pitch: Game.Random.Float( 0.9f, 1.1f ) );

			await Task.DelayRealtime( 50 );

			foreach ( var coin in coins )
				coin.SetCardType( CardType.MoneyBag );

			await Task.DelayRealtime( 300 );
		}

		await Task.DelayRealtime( 800 );

		Manager.Instance.PopEventMessage();
	}
}