[AFR] Implemented Yuan-Ti Malison

Mage/src/main/java/mage/abilities/condition/common/SourceAttackingAloneCondition.java

@@ -0,0 +1,24 @@
+package mage.abilities.condition.common;
+
+import mage.abilities.Ability;
+import mage.abilities.condition.Condition;
+import mage.game.Game;
+
+/**
+ *
+ * @author weirddan455
+ */
+public enum SourceAttackingAloneCondition implements Condition {
+
+    instance;
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        return game.getCombat().attacksAlone() && game.getCombat().getAttackers().get(0).equals(source.getSourceId());
+    }
+
+    @Override
+    public String toString() {
+        return "{this} is attacking alone";
+    }
+}