Create MonsterCard

Assets/Battle/CardsMonsters/MCardVampireFangs.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class MCardVampireFangs : MonsterCard
+{
+    public MCardVampireFangs(BattleParticipant owner)
+        : base(owner, MCardId.VampireFangs, "VampireFangs", 2, CardType.Attack,
+            "Steals 2 HP from target.") {
+    }
+
+    public override IEnumerator Use(IBattleEffectApplier effectApplier, MonsterViewpoint monsterViewpoint) {
+        BattleParticipant target = DetermineTarget(monsterViewpoint);
+        DealDamageEffect damageEffect = new DealDamageEffect(target, 2);
+        effectApplier.Apply(damageEffect);
+        if (damageEffect.AmountDealt > 0) {
+            HealEffect healEffect = new HealEffect(this.owner, damageEffect.AmountDealt);
+            effectApplier.Apply(healEffect);
+        }
+        yield break;
+    }
+
+    private BattleParticipant DetermineTarget(MonsterViewpoint monsterViewpoint) {
+        return monsterViewpoint.Heroes[0];
+    }
+}

Assets/Battle/CardsMonsters/MCardVampireFangs.cs.meta

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+MonoImporter:
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+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
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