DealDamage and AddBlock are effects

Assets/Battle/BattleController.cs

@@ -212,4 +212,12 @@ public class BattleController : MonoBehaviour, IBattleEffectApplier, IBattleEffe
             this.GetHeroDeck().ShuffleDrawPile();
         }
     }
+
+    public void DealDamage(BattleParticipant target, int amount) {
+        target.DealDamage(amount);
+    }
+
+    public void AddBlock(BattleParticipant target, int amount) {
+        target.AddBlock(amount);
+    }
 }

Assets/Battle/Cards/CardCover.cs

@@ -14,6 +14,6 @@ public class CardCover : BaseCard
         SingleTargeting singleTargeting = new SingleTargeting(new OtherHeroTargetPolicy(this.owner));
         yield return playerControls.StartCoroutine(playerControls.ChooseTarget(singleTargeting));
         BattleParticipant target = singleTargeting.GetTarget();
-        target.AddBlock(3);
+        effectApplier.Apply(new BlockEffect(target, 3));
     }
 }

Assets/Battle/Cards/CardCrashingPunch.cs

@@ -13,6 +13,6 @@ public class CardCrashingPunch : BaseCard
         SingleTargeting singleTargeting = new SingleTargeting(new AnyTargetPolicy());
         yield return playerControls.StartCoroutine(playerControls.ChooseTarget(singleTargeting));
         BattleParticipant target = singleTargeting.GetTarget();
-        target.DealDamage(3);
+        effectApplier.Apply(new DealDamageEffect(target, 3));
     }
 }

Assets/Battle/Cards/CardLightningStrike.cs

@@ -13,6 +13,6 @@ public class CardLightningStrike : BaseCard
         SingleTargeting singleTargeting = new SingleTargeting(new AnyTargetPolicy());
         yield return playerControls.StartCoroutine(playerControls.ChooseTarget(singleTargeting));
         BattleParticipant target = singleTargeting.GetTarget();
-        target.DealDamage(3);
+        effectApplier.Apply(new DealDamageEffect(target, 3));
     }
 }

Assets/Battle/Effects/BlockEffect.cs

@@ -0,0 +1,18 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class BlockEffect : IBattleEffect
+{
+    private BattleParticipant target;
+    private int amount;
+
+    public BlockEffect(BattleParticipant target, int amount) {
+        this.target = target;
+        this.amount = amount;
+    }
+
+    public void Apply(IBattleEffectResolver resolver) {
+        resolver.AddBlock(this.target, this.amount);
+    }
+}

Assets/Battle/Effects/BlockEffect.cs.meta

@@ -0,0 +1,11 @@
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Assets/Battle/Effects/DealDamageEffect.cs

@@ -0,0 +1,18 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class DealDamageEffect : IBattleEffect
+{
+    private BattleParticipant target;
+    private int amount;
+
+    public DealDamageEffect(BattleParticipant target, int amount) {
+        this.target = target;
+        this.amount = amount;
+    }
+
+    public void Apply(IBattleEffectResolver resolver) {
+        resolver.DealDamage(this.target, this.amount);
+    }
+}

Assets/Battle/Effects/DealDamageEffect.cs.meta

@@ -0,0 +1,11 @@
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Assets/Battle/IBattleEffectResolver.cs

@@ -3,6 +3,8 @@ using System.Collections.Generic;
 using UnityEngine;
 
 public interface IBattleEffectResolver {
+    void DealDamage(BattleParticipant target, int amount);
+    void AddBlock(BattleParticipant target, int amount);
     void IncreaseHeroMaxEnergy(int delta);
     void AcquireHeroCards(CardId[] cardIds, BattleZone zone, BattleHero owner);
 }