Add Doomwake Giant

lib/magic/cards/doomwake_giant.rb

@@ -0,0 +1,30 @@
+module Magic
+  module Cards
+    class DoomwakeGiant < Creature
+      card_name "Doomwake Giant"
+      cost generic: 4, black: 1
+      type "Enchantment Creature -- Giant"
+      power 4
+      toughness 6
+
+      class Trigger < TriggeredAbility
+        def should_perform?
+          # Whenever {this} or another enchantment enters under your control...
+          this? || (actor.type?("Enchantment") && event.permanent.controller?(controller))
+        end
+
+        def call
+          creatures_opponents_control.each do |creature|
+            actor.trigger_effect(:modify_power_toughness, power: -1, toughness: -1, target: creature, until_eot: true)
+          end
+        end
+      end
+
+      def event_handlers
+        {
+          Events::EnteredTheBattlefield => Trigger
+        }
+      end
+    end
+  end
+end

spec/cards/doomwake_giant_spec.rb

@@ -0,0 +1,63 @@
+require 'spec_helper'
+
+RSpec.describe Magic::Cards::DoomwakeGiant do
+  include_context "two player game"
+
+  subject(:doomwake_giant) { Card("Doomwake Giant") }
+  let(:p1_ajanis_pridemate) { ResolvePermanent("Ajani's Pridemate", owner: p1) }
+  let(:p2_ajanis_pridemate) { ResolvePermanent("Ajani's Pridemate", owner: p2) }
+
+  context "when doomwake giant enters" do
+    before do
+      p1_ajanis_pridemate
+      p2_ajanis_pridemate
+    end
+
+    it "gives all creatures opponent controls -1/-1 until end of turn" do
+      p1.add_mana(black: 5)
+      p1.cast(card: doomwake_giant) do
+        _1.pay_mana(generic: { black: 4 }, black: 1)
+      end
+
+      game.tick!
+
+      aggregate_failures do
+        expect(p1_ajanis_pridemate.power).to eq(2)
+        expect(p1_ajanis_pridemate.toughness).to eq(2)
+
+        expect(p2_ajanis_pridemate.power).to eq(1)
+        expect(p2_ajanis_pridemate.toughness).to eq(1)
+      end
+    end
+  end
+
+  context "when another enchantment enters" do
+    let(:doomwake_giant) { ResolvePermanent("Doomwake Giant") }
+
+    before do
+      doomwake_giant
+      p1_ajanis_pridemate
+      p2_ajanis_pridemate
+    end
+
+
+    let(:griffin_aerie) { Card("Griffin Aerie") }
+
+    it "gives all creatures opponent controls -1/-1 until end of turn" do
+      p1.add_mana(white: 2)
+      p1.cast(card: griffin_aerie) do
+        _1.pay_mana(generic: { white: 1 }, white: 1)
+      end
+
+      game.tick!
+
+      aggregate_failures do
+        expect(p1_ajanis_pridemate.power).to eq(2)
+        expect(p1_ajanis_pridemate.toughness).to eq(2)
+
+        expect(p2_ajanis_pridemate.power).to eq(1)
+        expect(p2_ajanis_pridemate.toughness).to eq(1)
+      end
+    end
+  end
+end