diff --git a/forge-ai/src/main/java/forge/ai/AiController.java b/forge-ai/src/main/java/forge/ai/AiController.java
index 658c66fd8ee..f86ed4b3ac7 100644
--- a/forge-ai/src/main/java/forge/ai/AiController.java
+++ b/forge-ai/src/main/java/forge/ai/AiController.java
@@ -737,6 +737,13 @@ public class AiController {
             int a1 = a.getPayCosts() == null ? 0 : a.getPayCosts().getTotalMana().getCMC();
             int b1 = b.getPayCosts() == null ? 0 : b.getPayCosts().getTotalMana().getCMC();
 
+            // deprioritize SAs explicitly marked as preferred to be activated last compared to all other SAs
+            if (a.hasParam("AIActivateLast") && !b.hasParam("AIActivateLast")) {
+                return 1;
+            } else if (b.hasParam("AIActivateLast") && !a.hasParam("AIActivateLast")) {
+                return -1;
+            }
+
             // deprioritize planar die roll marked with AIRollPlanarDieParams:LowPriority$ True
             if (ApiType.RollPlanarDice == a.getApi() && a.getHostCard() != null && a.getHostCard().hasSVar("AIRollPlanarDieParams") && a.getHostCard().getSVar("AIRollPlanarDieParams").toLowerCase().matches(".*lowpriority\\$\\s*true.*")) {
                 return 1;
diff --git a/forge-ai/src/main/java/forge/ai/ability/CountersPutAi.java b/forge-ai/src/main/java/forge/ai/ability/CountersPutAi.java
index 171d3431506..97eefea9ad8 100644
--- a/forge-ai/src/main/java/forge/ai/ability/CountersPutAi.java
+++ b/forge-ai/src/main/java/forge/ai/ability/CountersPutAi.java
@@ -12,10 +12,7 @@ import forge.game.ability.AbilityUtils;
 import forge.game.ability.ApiType;
 import forge.game.card.*;
 import forge.game.combat.CombatUtil;
-import forge.game.cost.Cost;
-import forge.game.cost.CostPart;
-import forge.game.cost.CostRemoveCounter;
-import forge.game.cost.CostSacrifice;
+import forge.game.cost.*;
 import forge.game.keyword.Keyword;
 import forge.game.phase.PhaseHandler;
 import forge.game.phase.PhaseType;
@@ -433,6 +430,18 @@ public class CountersPutAi extends SpellAbilityAi {
                 return false;
             }
 
+            // Activate +Loyalty planeswalker abilities even if they have no target (e.g. Vivien of the Arkbow),
+            // but try to do it in Main 2 then so that the AI has a chance to play creatures first.
+            if (list.isEmpty()
+                    && sa.hasParam("Planeswalker")
+                    && sa.getPayCosts() != null
+                    && sa.getPayCosts().hasOnlySpecificCostType(CostPutCounter.class)
+                    && sa.isTargetNumberValid()
+                    && sa.getTargets().getNumTargeted() == 0
+                    && ai.getGame().getPhaseHandler().is(PhaseType.MAIN2, ai)) {
+                return true;
+            }
+
             if (sourceName.equals("Abzan Charm")) {
                 final TargetRestrictions abTgt = sa.getTargetRestrictions();
                 // specific AI for instant with distribute two +1/+1 counters
diff --git a/forge-gui/res/cardsfolder/v/vivien_of_the_arkbow.txt b/forge-gui/res/cardsfolder/v/vivien_of_the_arkbow.txt
index 3fb233b6d82..f570d8b3fb8 100644
--- a/forge-gui/res/cardsfolder/v/vivien_of_the_arkbow.txt
+++ b/forge-gui/res/cardsfolder/v/vivien_of_the_arkbow.txt
@@ -1,7 +1,7 @@
 Name:Vivien of the Arkbow
 ManaCost:4 G G
 Types:Legendary Planeswalker Vivien
-A:AB$ PutCounter | Cost$ AddCounter<2/LOYALTY> | Planeswalker$ True | CounterNum$ 2 | CounterType$ P1P1 | TargetMin$ 0 | TargetMax$ 1 | ValidTgts$ Creature | TgtPrompt$ Select target creature | Planeswalker$ True | SpellDescription$ Put two +1/+1 counters on up to one target creature.
+A:AB$ PutCounter | Cost$ AddCounter<2/LOYALTY> | Planeswalker$ True | CounterNum$ 2 | CounterType$ P1P1 | TargetMin$ 0 | TargetMax$ 1 | ValidTgts$ Creature | TgtPrompt$ Select target creature | AIActivateLast$ True | SpellDescription$ Put two +1/+1 counters on up to one target creature.
 A:AB$ Pump | Cost$ SubCounter<3/LOYALTY> | Planeswalker$ True | | ValidTgts$ Creature.YouCtrl | AILogic$ PowerDmg | TgtPrompt$ Select target creature you control | SubAbility$ TailDamage | StackDescription$ None | SpellDescription$ Target creature you control deals damage equal to its power to target creature you don't control.
 SVar:TailDamage:DB$ DealDamage | ValidTgts$ Creature.YouDontCtrl | AILogic$ PowerDmg | TgtPrompt$ Select target creature you don't control | NumDmg$ X | References$ X | ConditionDefined$ Targeted | ConditionPresent$ Creature | ConditionCompare$ EQ1 | DamageSource$ ParentTarget
 SVar:X:ParentTargeted$CardPower