diff --git a/lib/magic/cards/quirion_dryad.rb b/lib/magic/cards/quirion_dryad.rb
new file mode 100644
index 0000000..7288754
--- /dev/null
+++ b/lib/magic/cards/quirion_dryad.rb
@@ -0,0 +1,32 @@
+module Magic
+  module Cards
+    QuirionDryad = Creature("Quirion Dryad") do
+      creature_type "Elf Druid"
+      cost generic: 1, green: 1
+      power 1
+      toughness 1
+    end
+
+    class QuirionDryad < Creature
+      TRIGGERING_COLORS = [:white, :blue, :black, :red].freeze
+
+      class SpellCastTrigger < TriggeredAbility::SpellCast
+        # Whenever you cast a spell that's white, blue, black, or red, ...
+        def should_perform?
+          you? && (spell.colors & TRIGGERING_COLORS).any?
+        end
+
+        # ...put a +1/+1 counter on Quirion Dryad.
+        def call
+          actor.trigger_effect(:add_counter, counter_type: "+1/+1", target: actor)
+        end
+      end
+
+      def event_handlers
+        {
+          Events::SpellCast => SpellCastTrigger
+        }
+      end
+    end
+  end
+end
diff --git a/spec/cards/quirion_dryad_spec.rb b/spec/cards/quirion_dryad_spec.rb
new file mode 100644
index 0000000..d439dff
--- /dev/null
+++ b/spec/cards/quirion_dryad_spec.rb
@@ -0,0 +1,129 @@
+# frozen_string_literal: true
+
+require "spec_helper"
+
+RSpec.describe Magic::Cards::QuirionDryad do
+  include_context "two player game"
+
+  subject!(:quirion_dryad) { ResolvePermanent("Quirion Dryad") }
+
+  it "starts as a 1/1" do
+    expect(quirion_dryad.power).to eq(1)
+    expect(quirion_dryad.toughness).to eq(1)
+  end
+
+  context "when you cast a white spell" do
+    it "puts a +1/+1 counter on Quirion Dryad" do
+      p1.add_mana(white: 2)
+      p1.cast(card: Card("Alpine Watchdog", owner: p1)) do
+        _1.pay_mana(white: 1, generic: { white: 1 })
+      end
+
+      game.stack.resolve!
+      game.tick!
+
+      expect(quirion_dryad.counters.of_type(Magic::Counters::Plus1Plus1).count).to eq(1)
+      expect(quirion_dryad.power).to eq(2)
+      expect(quirion_dryad.toughness).to eq(2)
+    end
+  end
+
+  context "when you cast a blue spell" do
+    it "puts a +1/+1 counter on Quirion Dryad" do
+      p1.add_mana(blue: 1)
+      p1.cast(card: Card("Aegis Turtle", owner: p1)) do
+        _1.pay_mana(blue: 1)
+      end
+
+      game.stack.resolve!
+
+      expect(quirion_dryad.counters.of_type(Magic::Counters::Plus1Plus1).count).to eq(1)
+    end
+  end
+
+  context "when you cast a black spell" do
+    it "puts a +1/+1 counter on Quirion Dryad" do
+      p1.add_mana(black: 5)
+      p1.cast(card: Card("Blood Glutton", owner: p1)) do
+        _1.pay_mana(black: 1, generic: { black: 4 })
+      end
+
+      game.stack.resolve!
+
+      expect(quirion_dryad.counters.of_type(Magic::Counters::Plus1Plus1).count).to eq(1)
+    end
+  end
+
+  context "when you cast a red spell" do
+    it "puts a +1/+1 counter on Quirion Dryad" do
+      p1.add_mana(red: 1)
+      p1.cast(card: Card("Shock", owner: p1)) do
+        _1.targeting(p2)
+        _1.pay_mana(red: 1)
+      end
+
+      game.stack.resolve!
+
+      expect(quirion_dryad.counters.of_type(Magic::Counters::Plus1Plus1).count).to eq(1)
+    end
+  end
+
+  context "when you cast a green spell" do
+    it "does not put a +1/+1 counter on Quirion Dryad" do
+      p1.add_mana(green: 2)
+      p1.cast(card: Card("Grizzly Bears", owner: p1)) do
+        _1.pay_mana(green: 1, generic: { green: 1 })
+      end
+
+      game.stack.resolve!
+
+      expect(quirion_dryad.counters.of_type(Magic::Counters::Plus1Plus1).count).to eq(0)
+      expect(quirion_dryad.power).to eq(1)
+      expect(quirion_dryad.toughness).to eq(1)
+    end
+  end
+
+  context "when you cast a colorless spell" do
+    it "does not put a +1/+1 counter on Quirion Dryad" do
+      p1.add_mana(green: 2)
+      p1.cast(card: Card("Alpha Myr", owner: p1)) do
+        _1.pay_mana(generic: { green: 2 })
+      end
+
+      game.stack.resolve!
+
+      expect(quirion_dryad.counters.of_type(Magic::Counters::Plus1Plus1).count).to eq(0)
+    end
+  end
+
+  context "when an opponent casts a white spell" do
+    it "does not put a +1/+1 counter on Quirion Dryad" do
+      watchdog = Card("Alpine Watchdog", owner: p2)
+      p2.hand.add(watchdog)
+      p2.add_mana(white: 2)
+      p2.cast(card: watchdog) do
+        _1.pay_mana(white: 1, generic: { white: 1 })
+      end
+
+      game.stack.resolve!
+
+      expect(quirion_dryad.counters.of_type(Magic::Counters::Plus1Plus1).count).to eq(0)
+    end
+  end
+
+  context "when an opponent casts a red spell" do
+    it "does not put a +1/+1 counter on Quirion Dryad" do
+      shock = Card("Shock", owner: p2)
+      p2.hand.add(shock)
+      p2.add_mana(red: 1)
+      p2.cast(card: shock) do
+        _1.targeting(p1)
+        _1.pay_mana(red: 1)
+      end
+
+      game.stack.resolve!
+
+      expect(quirion_dryad.counters.of_type(Magic::Counters::Plus1Plus1).count).to eq(0)
+    end
+  end
+end