Xantcha, Sleeper Agent implemented.

Added a new effect (LoseLifePermanentControllerEffect).

Mage/src/main/java/mage/abilities/effects/common/LoseLifePermanentControllerEffect.java

@@ -0,0 +1,63 @@
+package mage.abilities.effects.common;
+
+import mage.abilities.Ability;
+import mage.abilities.dynamicvalue.DynamicValue;
+import mage.abilities.dynamicvalue.common.StaticValue;
+import mage.abilities.effects.OneShotEffect;
+import mage.constants.Outcome;
+import mage.game.Game;
+import mage.game.permanent.Permanent;
+import mage.players.Player;
+
+
+
+/**
+ * This effect applies to the permanent's controller which originated the ability, but not to the controller of that
+ * source ability.
+ * @author jesusjbr
+ */
+public class LoseLifePermanentControllerEffect extends OneShotEffect {
+
+    protected DynamicValue amount;
+
+    public LoseLifePermanentControllerEffect(int amount) {
+        this(new StaticValue(amount));
+    }
+
+    public LoseLifePermanentControllerEffect(DynamicValue amount) {
+        super(Outcome.LoseLife);
+        this.amount = amount;
+        setText();
+    }
+
+    public LoseLifePermanentControllerEffect(final LoseLifePermanentControllerEffect effect) {
+        super(effect);
+        this.amount = effect.amount.copy();
+    }
+
+    @Override
+    public LoseLifePermanentControllerEffect copy() {
+        return new LoseLifePermanentControllerEffect(this);
+    }
+
+    @Override
+    public boolean apply(Game game, Ability source) {
+        Permanent permanent = source.getSourcePermanentIfItStillExists(game);
+        Player player = null;
+        if (permanent != null) {
+            player = game.getPlayer(permanent.getControllerId());
+        }
+        if (player != null) {
+            player.loseLife(amount.calculate(game, source, this), game, false);
+            return true;
+        }
+        return false;
+    }
+
+    private void setText() {
+        StringBuilder sb = new StringBuilder();
+        sb.append("controller ").append("loses").append(amount.toString()).append("life");
+        staticText += sb.toString();
+    }
+
+}