Implement Triggers and Scarring

Assets/Battle/Cards/CardScarring.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class CardScarring : BaseCard
+{
+    public CardScarring(BattleParticipant owner)
+        : base(owner, CardId.Scarring, "Scarring", 2, CardType.Skill,
+            "Block 4 damage. The next time damage is taken until next turn, gain 1 Max HP.") {
+    }
+
+    public override IEnumerator Use(IBattleEffectApplier effectApplier, BattlePlayerControls playerControls) {
+        effectApplier.Apply(new BlockEffect(this.owner, 4));
+        // TODO: Trigger only until end of turn.
+        DamageTrigger trigger = new DamageTrigger(
+            new List<BattleParticipant>() {this.owner},
+            this.NotifyDamageDealt,
+            TriggerExpiration.StartOfNextHeroTurn,
+            TriggerRepetition.Once);
+        effectApplier.Apply(new ArmDamageTriggerEffect(trigger));
+        yield break;
+    }
+
+    public void NotifyDamageDealt(IBattleEffectApplier effectApplier) {
+        Debug.Log("NotifyDamageDealt ");
+        IncreaseMaxHPEffect effect = new IncreaseMaxHPEffect(this.owner, 1);
+        effectApplier.Apply(effect);
+    }
+}

Assets/Battle/Cards/CardScarring.cs.meta

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