Add guards and implement basic cards

Assets/Battle/Effects/MassBlockEffect.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class MassBlockEffect : IBattleEffect
+{
+    private TeamChoice team;
+    private int amount;
+
+    public MassBlockEffect(TeamChoice team, int amount) {
+        this.team = team;
+        this.amount = amount;
+    }
+
+    public void Apply(IBattleEffectResolver resolver) {
+        resolver.AddMassBlock(this);
+    }
+
+    public TeamChoice Team {get => this.team;}
+    public int Amount {get => this.amount;}
+}

Assets/Battle/Effects/MassBlockEffect.cs.meta

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