Converted enough to send the system card

PluralKit.Bot/CommandSystem/ContextEntityArgumentsExt.cs

@@ -3,6 +3,8 @@
 using DSharpPlus;
 using DSharpPlus.Entities;
 
+using Myriad.Types;
+
 using PluralKit.Bot.Utils;
 using PluralKit.Core;
 
@@ -153,13 +155,16 @@ namespace PluralKit.Bot
             return $"Group not found. Note that a group ID is 5 characters long.";
         }
         
-        public static async Task<DiscordChannel> MatchChannel(this Context ctx)
+        public static async Task<Channel> MatchChannel(this Context ctx)
         {
             if (!MentionUtils.TryParseChannel(ctx.PeekArgument(), out var id)) 
                 return null;
+
+            if (!ctx.Cache.TryGetChannel(id, out var channel))
+                return null;
             
-            var channel = await ctx.Shard.GetChannel(id);
-            if (channel == null || !(channel.Type == ChannelType.Text || channel.Type == ChannelType.News)) return null;
+            if (!(channel.Type == Channel.ChannelType.GuildText || channel.Type == Channel.ChannelType.GuildText)) 
+                return null;
             
             ctx.PopArgument();
             return channel;