Drop .card-{color} modifiers for .bg-{color}, .text-{color}, and .border-{color} utilities

scss/_card.scss

@@ -100,42 +100,6 @@
   margin-left: -($card-spacer-x / 2);
 }
 
-
-//
-// Background variations
-//
-
-@each $color, $value in $theme-colors {
-  .card-#{$color} {
-    @include card-variant($value, $value);
-  }
-}
-
-@each $color, $value in $theme-colors {
-  .card-outline-#{$color} {
-    @include card-variant($value, $value);
-  }
-}
-
-
-//
-// Inverse text within a card for use with dark backgrounds
-//
-
-.card-dark {
-  @include card-dark;
-}
-
-//
-// Blockquote
-//
-
-.card-blockquote {
-  padding: 0;
-  margin-bottom: 0;
-  border-left: 0;
-}
-
 // Card image
 .card-img-overlay {
   position: absolute;

scss/_mixins.scss

@@ -19,7 +19,6 @@
 // // Components
 @import "mixins/alert";
 @import "mixins/buttons";
-@import "mixins/cards";
 @import "mixins/pagination";
 @import "mixins/lists";
 @import "mixins/list-group";

scss/mixins/_cards.scss

@@ -1,53 +0,0 @@
-// Card variants
-
-@mixin card-variant($background, $border) {
-  background-color: $background;
-  border-color: $border;
-
-  .card-header,
-  .card-footer {
-    background-color: transparent;
-  }
-}
-
-@mixin card-outline-variant($color) {
-  background-color: transparent;
-  border-color: $color;
-
-  .card-header,
-  .card-footer {
-    background-color: transparent;
-    border-color: $color;
-  }
-}
-
-//
-// Inverse text within a card for use with dark backgrounds
-//
-
-@mixin card-dark {
-  color: rgba(255,255,255,.65);
-
-  .card-header,
-  .card-footer {
-    background-color: transparent;
-    border-color: rgba(255,255,255,.2);
-  }
-  .card-header,
-  .card-footer,
-  .card-title,
-  .card-blockquote {
-    color: #fff;
-  }
-  .card-link,
-  .card-text,
-  .card-subtitle,
-  .card-blockquote .blockquote-footer {
-    color: rgba(255,255,255,.65);
-  }
-  .card-link {
-    @include hover-focus {
-      color: $card-dark-link-hover-color;
-    }
-  }
-}