Add missing graveyard card

lib/magic/graveyard_card.rb

@@ -0,0 +1,21 @@
+module Magic
+  class GraveyardCard
+    attr_reader :card
+
+    def initialize(card:)
+      @card = card
+    end
+
+    def inspect
+      "#<GraveyardCard name:#{name}>"
+    end
+
+    def activated_abilities
+      @card.activated_abilities.map { |ability| ability.new(source: card) }
+    end
+
+    def method_missing(name, *args, &block)
+      @card.send(name, *args, &block)
+    end
+  end
+end