From bfe91ad32b05cbc6e34c996f3c160836998d8ea8 Mon Sep 17 00:00:00 2001
From: Daniel Bomar <dbdaniel42@gmail.com>
Date: Sat, 20 Feb 2021 11:42:49 -0600
Subject: [PATCH] Fixed Foretold cards with cost reduced to 0 being uncastable
 (fixes #7607)

---
 .../main/java/mage/abilities/keyword/ForetellAbility.java   | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Mage/src/main/java/mage/abilities/keyword/ForetellAbility.java b/Mage/src/main/java/mage/abilities/keyword/ForetellAbility.java
index 26d2527a0f0..abd1b080544 100644
--- a/Mage/src/main/java/mage/abilities/keyword/ForetellAbility.java
+++ b/Mage/src/main/java/mage/abilities/keyword/ForetellAbility.java
@@ -294,6 +294,12 @@ public class ForetellAbility extends SpecialAction {
 
         public ForetellCostAbility(String foretellCost) {
             super(null, "Testing", Zone.EXILED, SpellAbilityType.BASE_ALTERNATE, SpellAbilityCastMode.NORMAL);
+            // Needed for Dream Devourer and Ethereal Valkyrie reducing the cost of a colorless CMC 2 or less spell to 0
+            // CardUtil.reduceCost returns an empty string in that case so we add a cost of 0 here
+            // https://github.com/magefree/mage/issues/7607
+            if (foretellCost != null && foretellCost.isEmpty()) {
+                foretellCost = "{0}";
+            }
             this.setAdditionalCostsRuleVisible(false);
             this.name = "Foretell " + foretellCost;
             this.addCost(new ManaCostsImpl(foretellCost));