diff --git a/.gitattributes b/.gitattributes
index 99d2a69d5a5..bb3ee2fddeb 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -9392,6 +9392,7 @@ res/cardsfolder/s/spellbreaker_behemoth.txt svneol=native#text/plain
 res/cardsfolder/s/spellgorger_barbarian.txt svneol=native#text/plain
 res/cardsfolder/s/spellshock.txt svneol=native#text/plain
 res/cardsfolder/s/spellstutter_sprite.txt svneol=native#text/plain
+res/cardsfolder/s/spelltithe_enforcer.txt -text
 res/cardsfolder/s/spelltwine.txt -text
 res/cardsfolder/s/spellweaver_helix.txt -text svneol=unset#text/plain
 res/cardsfolder/s/spellwild_ouphe.txt -text
diff --git a/res/cardsfolder/n/nether_void.txt b/res/cardsfolder/n/nether_void.txt
index b9ae76fd9bb..0d3b5c45eb0 100644
--- a/res/cardsfolder/n/nether_void.txt
+++ b/res/cardsfolder/n/nether_void.txt
@@ -5,6 +5,7 @@ Text:no text
 T:Mode$ SpellCast | ValidCard$ Card | ValidActivatingPlayer$ Player | TriggerZones$ Battlefield | Execute$ TrigCounter | TriggerDescription$ Whenever a player casts a spell, counter it unless its controller pays 3.
 SVar:TrigCounter:DB$ Counter | Cost$ 0 | UnlessCost$ 3 | Defined$ TriggeredSpellAbility | UnlessPayer$ TriggeredCardController
 SVar:RemRandomDeck:True
+SVar:SpellsNeedExtraMana:3
 SVar:Rarity:Rare
 SVar:Picture:http://www.wizards.com/global/images/magic/general/nether_void.jpg
 SetInfo:LEG|Rare|http://magiccards.info/scans/en/lg/27.jpg
diff --git a/res/cardsfolder/s/spelltithe_enforcer.txt b/res/cardsfolder/s/spelltithe_enforcer.txt
new file mode 100644
index 00000000000..2f811e0583d
--- /dev/null
+++ b/res/cardsfolder/s/spelltithe_enforcer.txt
@@ -0,0 +1,13 @@
+Name:Spelltithe Enforcer
+ManaCost:3 W W
+Types:Creature Elephant Wizard
+Text:no text
+PT:3/3
+T:Mode$ SpellCast | ValidCard$ Card | ValidActivatingPlayer$ Opponent | TriggerZones$ Battlefield | Execute$ TrigSac | TriggerDescription$ Whenever an opponent casts a spell, that player sacrifices a permanent unless he or she pays {1}.
+SVar:TrigSac:DB$ Sacrifice | Defined$ TriggeredCardController | SacValid$ Permanent | SacMessage$ Permanent | UnlessCost$ 1 | UnlessPayer$ TriggeredCardController
+SVar:SpellsNeedExtraMana:1
+SVar:Rarity:Rare
+SVar:Picture:http://www.wizards.com/global/images/magic/general/spelltithe_enforcer.jpg
+SetInfo:GPT|Rare|http://magiccards.info/scans/en/gp/18.jpg
+Oracle:Whenever an opponent casts a spell, that player sacrifices a permanent unless he or she pays {1}.
+End
\ No newline at end of file
diff --git a/src/main/java/forge/game/player/ComputerUtil.java b/src/main/java/forge/game/player/ComputerUtil.java
index 58466a9dc07..42832c47485 100644
--- a/src/main/java/forge/game/player/ComputerUtil.java
+++ b/src/main/java/forge/game/player/ComputerUtil.java
@@ -52,6 +52,7 @@ import forge.card.mana.ManaCost;
 import forge.card.mana.ManaPool;
 import forge.card.spellability.AbilityManaPart;
 import forge.card.spellability.AbilityStatic;
+import forge.card.spellability.Spell;
 import forge.card.spellability.SpellAbility;
 import forge.card.spellability.Target;
 import forge.control.input.InputPayManaCostUtil;
@@ -395,7 +396,7 @@ public class ComputerUtil {
         newSA.setDescription(sb.toString());
         newSA.setActivatingPlayer(ai);
 
-        if (!ComputerUtil.canPayAdditionalCosts(ai, newSA)) {
+        if (!ComputerUtil.canPayAdditionalCosts(newSA, ai)) {
             return;
         }
 
@@ -500,7 +501,25 @@ public class ComputerUtil {
      * @return a boolean.
      */
     public static boolean canPayCost(final SpellAbility sa, final Player player) {
-        if (!ComputerUtil.payManaCost(sa, player, true, 0, true)) {
+
+        // Check for stuff like Nether Void
+        int extraManaNeeded = 0;
+        if (sa instanceof Spell && player.isComputer()) {
+            for (Player opp : player.getOpponents()) {
+                for (Card c : opp.getCardsIn(ZoneType.Battlefield)) {
+                    final String snem = c.getSVar("SpellsNeedExtraMana");
+                    if (!snem.equals("")) {
+                        try {
+                            extraManaNeeded += Integer.parseInt(snem);
+                        } catch (final NumberFormatException e) {
+                            System.out.println("wrong SpellsNeedExtraMana SVar format on " + c);
+                        } 
+                    }
+                }
+            }
+        }
+
+        if (!ComputerUtil.payManaCost(sa, player, true, extraManaNeeded, true)) {
             return false;
         }
 
@@ -533,19 +552,6 @@ public class ComputerUtil {
         return xMana;
     }
 
-    /**
-     * <p>
-     * canPayAdditionalCosts.
-     * </p>
-     * 
-     * @param sa
-     *            a {@link forge.card.spellability.SpellAbility} object.
-     * @return a boolean.
-     */
-    public static boolean canPayAdditionalCosts(final Player ai, final SpellAbility sa) {
-        return ComputerUtil.canPayAdditionalCosts(sa, ai);
-    }
-
     /**
      * <p>
      * canPayAdditionalCosts.
@@ -887,11 +893,12 @@ public class ComputerUtil {
 
         final Card card = sa.getSourceCard();
         // Tack xMana Payments into mana here if X is a set value
-        if ((sa.getPayCosts() != null) && (cost.getXcounter() > 0)) {
+        if ((sa.getPayCosts() != null) && (cost.getXcounter() > 0 || extraMana > 0)) {
 
             int manaToAdd = 0;
-            if (test && (extraMana > 0)) {
-                manaToAdd = extraMana * cost.getXcounter();
+            if (test && extraMana > 0) {
+                final int multiplicator = Math.max(cost.getXcounter(), 1);
+                manaToAdd = extraMana * multiplicator;
             } else {
                 // For Count$xPaid set PayX in the AFs then use that here
                 // Else calculate it as appropriate.