Add Storm Caller

Fixes #346

lib/magic/cards/storm_caller.rb

@@ -0,0 +1,27 @@
+module Magic
+  module Cards
+    StormCaller = Creature("Storm Caller") do
+      creature_type("Ogre Shaman")
+      cost red: 1, generic: 2
+      power 3
+      toughness 2
+    end
+
+    class StormCaller < Creature
+      class ETB < TriggeredAbility::EnterTheBattlefield
+
+        def perform
+          effect = Effects::DealDamage.new(
+            source: permanent,
+            choices: game.opponents(controller),
+            targets: game.opponents(controller),
+            damage: 2,
+          )
+          game.add_effect(effect)
+        end
+      end
+
+      def etb_triggers = [ETB]
+    end
+  end
+end

spec/cards/storm_caller_spec.rb

@@ -0,0 +1,14 @@
+require 'spec_helper'
+
+RSpec.describe Magic::Cards::StormCaller do
+  include_context "two player game"
+
+  let(:card) { Card("Storm Caller") }
+
+  it "deals 2 damage to each opponent" do
+    p2_starting_life = p2.life
+    card.resolve!(p1)
+
+    expect(p2.life).to eq(p2_starting_life - 2)
+  end
+end