diff --git a/BulkDataList.cs b/BulkDataList.cs
index 67647ef..5c1e74f 100644
--- a/BulkDataList.cs
+++ b/BulkDataList.cs
@@ -1,6 +1,9 @@
 using System;
 namespace Sharpfall
 {
+    //fyi: there's a Guid built in to .net. But it's not necessarily exactly identical to RFC4122's description of a uuid.
+    using UUID = System.String;
+    
     public class BulkDataList
     {
         public string @object { get; set; }
@@ -10,7 +13,7 @@ namespace Sharpfall
     public class BulkMetaEntry
     {
         public string @object { get; set; }
-        public Guid id { get; set; }
+        public UUID id { get; set; }
         public string type { get; set; }
         public DateTime updated_at { get; set; }
         public Uri uri { get; set; }
diff --git a/Card.cs b/Card.cs
index e59361d..c2adad1 100644
--- a/Card.cs
+++ b/Card.cs
@@ -5,7 +5,6 @@ namespace Sharpfall
 {
     //fyi: there's a Guid built in to .net. But it's not necessarily exactly identical to RFC4122's description of a uuid.
     using UUID = System.String;
-    using Colors = IEnumerable<Color>;
     public class Card
     {
         public int? arena_id; //This card’s Arena ID, if any. A large percentage of cards are not available on Arena and do not have this ID.
@@ -27,9 +26,9 @@ namespace Sharpfall
         public IEnumerable<RelatedCard> all_parts; //If this card is closely related to other cards, this property will be an array with Related Card Objects.
         public IEnumerable<CardFace> card_faces; //An array of Card Face objects, if this card is multifaced.
         public decimal cmc; //The card’s converted mana cost. Note that some funny cards have fractional mana costs.
-        public Colors color_identity; //This card’s color identity.
-        public Colors color_indicator; //The colors in this card’s color indicator, if any. A null value for this field indicates the card does not have one.
-        public Colors colors; //This card’s colors, if the overall card has colors defined by the rules. Otherwise the colors will be on the card_faces objects, see below.
+        public IEnumerable<Color> color_identity; //This card’s color identity.
+        public IEnumerable<Color> color_indicator; //The colors in this card’s color indicator, if any. A null value for this field indicates the card does not have one.
+        public IEnumerable<Color> colors; //This card’s colors, if the overall card has colors defined by the rules. Otherwise the colors will be on the card_faces objects, see below.
         public int? edhrec_rank; //This card’s overall rank/popularity on EDHREC. Not all cards are ranked.
         public string hand_modifier; //This card’s hand modifier, if it is Vanguard card. This value will contain a delta, such as -1.
         public IEnumerable<string> keywords; //An array of keywords that this card uses, such as 'Flying' and 'Cumulative upkeep'.
@@ -42,7 +41,7 @@ namespace Sharpfall
         public string oracle_text; //The Oracle text for this card, if any.
         public bool oversized; //True if this card is oversized.
         public string power; //This card’s power, if any. Note that some cards have powers that are not numeric, such as *.
-        public Colors produced_mana; //Colors of mana that this card could produce.
+        public IEnumerable<Color> produced_mana; //Colors of mana that this card could produce.
         public bool reserved; //True if this card is on the Reserved List.
         public string toughness; //This card’s toughness, if any. Note that some cards have toughnesses that are not numeric, such as *.
         public string type_line; //The type line of this card. 
diff --git a/CardFace.cs b/CardFace.cs
index ad90909..388eb66 100644
--- a/CardFace.cs
+++ b/CardFace.cs
@@ -4,12 +4,11 @@ using System.Collections.Generic;
 namespace Sharpfall
 {
     using UUID = System.String;
-    using Colors = IEnumerable<Color>;
     public class CardFace
     {
         public string artist { get; set; } //The name of the illustrator of this card face. Newly spoiled cards may not have this field yet.
-        public Colors color_indicator { get; set; } //The colors in this face’s color indicator, if any.
-        public Colors colors { get; set; } //This face’s colors, if the game defines colors for the individual face of this card.
+        public IEnumerable<Color> color_indicator { get; set; } //The colors in this face’s color indicator, if any.
+        public IEnumerable<Color> colors { get; set; } //This face’s colors, if the game defines colors for the individual face of this card.
         public string flavor_text { get; set; } //The flavor text printed on this face, if any.
         public UUID illustration_id { get; set; } //A unique identifier for the card face artwork that remains consistent across reprints. Newly spoiled cards may not have this field yet.
         public Images image_uris { get; set; } //An object providing URIs to imagery for this face, if this is a double-sided card. If this card is not double-sided, then the image_uris property will be part of the parent object instead.
diff --git a/RelatedCard.cs b/RelatedCard.cs
index bfaa093..ed5d2fb 100644
--- a/RelatedCard.cs
+++ b/RelatedCard.cs
@@ -4,7 +4,6 @@ using System.Collections.Generic;
 namespace Sharpfall
 {
     using UUID = System.String;
-    using Colors = IEnumerable<Color>;
     public class RelatedCard
     {
         public UUID id { get; set; } //An unique ID for this card in Scryfall’s database.