Add Teferi's Protoge

lib/magic/cards/teferis_protoge.rb

@@ -0,0 +1,22 @@
+module Magic
+  module Cards
+    class TeferisProtoge < Creature
+      card_name "Teferi's Protoge"
+      creature_type "Human Wizard"
+      cost "{2}{U}"
+      power 2
+      toughness 3
+
+      class ActivatedAbility < Magic::ActivatedAbility
+        costs "{1}{U}, {T}"
+
+        def resolve!
+          trigger_effect(:draw_cards, player: controller)
+          add_choice(:discard)
+        end
+      end
+
+      def activated_abilities = [ActivatedAbility]
+    end
+  end
+end

spec/cards/teferis_protege_spec.rb

@@ -0,0 +1,21 @@
+require "spec_helper"
+
+RSpec.describe Magic::Cards::TeferisProtoge do
+  include_context "two player game"
+  subject { ResolvePermanent("Teferi's Protoge") }
+
+  context "activated ability" do
+    it "activates the ability" do
+      expect(p1).to receive(:draw!)
+      p1.add_mana(blue: 2)
+      p1.activate_ability(ability: subject.activated_abilities.first) do
+        _1.pay_mana(generic: { blue: 1 }, blue: 1)
+      end
+
+      game.tick!
+
+      choice = game.choices.last
+      expect(choice).to be_a(Magic::Choice::Discard)
+    end
+  end
+end