Implement Molotov Cocktail

Assets/Battle/CardsHeroes/MolotovCocktailHCard.cs

@@ -0,0 +1,30 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class MolotovCocktailHCard : HeroCard
+{
+    public MolotovCocktailHCard(BattleParticipant owner)
+        : base(owner, HCardId.MolotovCocktail, "Molotov Cocktail", 3, CardType.Enchantment,
+            "At start of hero turn, deal 1 damage to all enemies.") {
+    }
+
+    public override IEnumerator Use(IBattleEffectApplier effectApplier,
+            MonsterViewpoint viewpoint, BattlePlayerControls playerControls) {
+        StepTrigger trigger = new StepTrigger(
+            RoundStep.StartOfHeroTurn,
+            this.AtStartOfHeroTurn,
+            TriggerExpiration.Never,
+            TriggerRepetition.Multiple);
+        effectApplier.Apply(new ArmStepTriggerEffect(trigger));
+        yield break;
+    }
+
+    private IEnumerator AtStartOfHeroTurn(IBattleEffectApplier effectApplier,
+            MonsterViewpoint viewpoint, BattlePlayerControls playerControls) {
+        yield return new WaitForSeconds(0.3f);
+        MassDamageEffect damageEffect = new MassDamageEffect(TeamChoice.Monsters, 1);
+        effectApplier.Apply(damageEffect);
+        yield break;
+    }
+}