diff --git a/forge-ai/src/main/java/forge/ai/ComputerUtilMana.java b/forge-ai/src/main/java/forge/ai/ComputerUtilMana.java
index cd890ca1cfb..3011e56ba06 100644
--- a/forge-ai/src/main/java/forge/ai/ComputerUtilMana.java
+++ b/forge-ai/src/main/java/forge/ai/ComputerUtilMana.java
@@ -1115,7 +1115,9 @@ public class ComputerUtilMana {
                 final String xSvar = card.getSVar("X").startsWith("Count$xPaid") ? "PayX" : "X";
                 if (!sa.getSVar(xSvar).isEmpty() || card.hasSVar(xSvar)) {
                     if (xSvar.equals("PayX") && card.hasSVar(xSvar)) {
-                        manaToAdd = Integer.parseInt(card.getSVar(xSvar)) * cost.getXcounter(); // X
+                         // X SVar may end up being an empty string when copying a spell with no cost (e.g. Jhoira Avatar)
+                        String xValue = card.getSVar(xSvar);
+                        manaToAdd = xValue.isEmpty() ? 0 : Integer.parseInt(card.getSVar(xSvar)) * cost.getXcounter(); // X
                     } else {
                         manaToAdd = AbilityUtils.calculateAmount(card, xSvar, sa) * cost.getXcounter();
                     }
diff --git a/forge-ai/src/main/java/forge/ai/SpecialCardAi.java b/forge-ai/src/main/java/forge/ai/SpecialCardAi.java
index 0ea94e90725..26912848459 100644
--- a/forge-ai/src/main/java/forge/ai/SpecialCardAi.java
+++ b/forge-ai/src/main/java/forge/ai/SpecialCardAi.java
@@ -25,6 +25,7 @@ import forge.card.ColorSet;
 import forge.card.MagicColor;
 import forge.card.mana.ManaCost;
 import forge.game.Game;
+import forge.game.GameType;
 import forge.game.ability.AbilityFactory;
 import forge.game.ability.AbilityUtils;
 import forge.game.ability.ApiType;
@@ -43,6 +44,7 @@ import forge.game.staticability.StaticAbility;
 import forge.game.trigger.Trigger;
 import forge.game.zone.ZoneType;
 import forge.util.Aggregates;
+import forge.util.MyRandom;
 import forge.util.TextUtil;
 import forge.util.maps.LinkedHashMapToAmount;
 import forge.util.maps.MapToAmount;
@@ -778,6 +780,14 @@ public class SpecialCardAi {
             if (source.getGame().getPhaseHandler().getPhase().isBefore(PhaseType.MAIN1)) {
                 return false;
             }
+
+            // In MoJhoSto, prefer Jhoira sorcery ability from time to time
+            if (source.getGame().getRules().hasAppliedVariant(GameType.MoJhoSto)
+                    && CardLists.filter(ai.getLandsInPlay(), CardPredicates.Presets.UNTAPPED).size() >= 3
+                    && MyRandom.percentTrue(50)) {
+                return false;
+            }
+
             // Set PayX here to maximum value.
             int tokenSize = ComputerUtilMana.determineLeftoverMana(sa, ai);
 
diff --git a/forge-ai/src/main/java/forge/ai/ability/PlayAi.java b/forge-ai/src/main/java/forge/ai/ability/PlayAi.java
index 5d9876bd759..90896e6f1e5 100644
--- a/forge-ai/src/main/java/forge/ai/ability/PlayAi.java
+++ b/forge-ai/src/main/java/forge/ai/ability/PlayAi.java
@@ -5,6 +5,7 @@ import forge.ai.*;
 import forge.card.CardStateName;
 import forge.card.CardTypeView;
 import forge.game.Game;
+import forge.game.GameType;
 import forge.game.ability.AbilityUtils;
 import forge.game.card.Card;
 import forge.game.card.CardCollection;
@@ -16,6 +17,7 @@ import forge.game.spellability.Spell;
 import forge.game.spellability.SpellAbility;
 import forge.game.spellability.TargetRestrictions;
 import forge.game.zone.ZoneType;
+import forge.util.MyRandom;
 
 import java.util.List;
 
@@ -51,7 +53,15 @@ public class PlayAi extends SpellAbilityAi {
                 return false;
             }
         }
-        
+
+        if (game.getRules().hasAppliedVariant(GameType.MoJhoSto) && source.getName().equals("Jhoira of the Ghitu Avatar")) {
+            // Some additional logic for MoJhoSto: don't spam activate the Instant copying ability all the time
+            // Can probably be improved, but as random as MoJhoSto already is, probably not a huge deal for now
+            if ("Instant".equals(sa.getParam("AnySupportedCard")) && MyRandom.percentTrue(80)) {
+                return false;
+            }
+        }
+
         if ("ReplaySpell".equals(logic)) {
             return ComputerUtil.targetPlayableSpellCard(ai, cards, sa, sa.hasParam("WithoutManaCost"));                
         }