add amount: its toughness

src/magic/model/MagicAmountFactory.java

@@ -118,6 +118,15 @@ public class MagicAmountFactory {
             }
         };
 
+    public static MagicAmount SN_Toughness =
+        new MagicAmount() {
+            @Override
+            public int getAmount(final MagicSource source, final MagicPlayer player) {
+                final MagicPermanent perm = (MagicPermanent)source;
+                return perm.getToughness();
+            }
+        };
+
     public static MagicAmount LifeTotal =
         new MagicAmount() {
             @Override

src/magic/model/MagicAmountParser.java

@@ -45,6 +45,12 @@ public enum MagicAmountParser {
             return MagicAmountFactory.SN_Power;
         }
     },
+    ItsToughness("(its|SN's) toughness") {
+        @Override
+        public MagicAmount toAmount(final Matcher arg) {
+            return MagicAmountFactory.SN_Toughness;
+        }
+    },
     RNsPower("RN's power") {
         @Override
         public MagicAmount toAmount(final Matcher arg) {