maybe before cycling import

failsafe

Assets/Scripts/UnitScripts/Capacities/BaseCapacity.cs

@@ -1,10 +1,11 @@
 using UnityEngine;
+using UnityEngine.Serialization;
 
 public class BaseCapacity : MonoBehaviour
 {
     [field: SerializeField] public float MaxMana { get; private set; }
     [field: SerializeField] public float Mana { get; private set; }
-    protected float ManaCost;
+    [SerializeField] private float manaCost;
     protected AbstractUnit _unit;
 
     
@@ -30,10 +31,10 @@ public class BaseCapacity : MonoBehaviour
     // Update is called once per frame
     void Update()
     {
-        if (Mana >= ManaCost)
+        if (Mana >= manaCost)
         {
             bool capacityLaunched = CapacityCall();
-            if (capacityLaunched) Mana -= ManaCost;
+            if (capacityLaunched) Mana -= manaCost;
         }
     }
 }

Assets/Scripts/UnitScripts/Capacities/WitchSummon.cs

@@ -0,0 +1,12 @@
+using UnityEngine;
+
+public class WitchSummon : BaseCapacity
+{
+   [SerializeField] private GameObject summonUnit;
+
+   protected override bool CapacityCall()
+   {
+      Instantiate(summonUnit, transform.position, Quaternion.identity);
+      return true;
+   }
+}

Assets/Scripts/UnitScripts/Capacities/WitchSummon.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: 1c3c6b3848aa5f3cd9b73630ddae811e