They made their debut in Innistrad way back in 2011, where they were used to indicate the dual nature of many of the denizens of the plane
The cards are: Serialized Poster Cards Andril, Flame of the West Aragorn, the Uniter Arwen, Mortal Queen Dawn of a New Age Gandalf the White Glamdring Hew the Entwood Last March of the Ents Mount Doom Palantr of Orthanc Radagast the Brown Saruman of Many Colors Sauron, the Dark Lord Shadow of the Enemy Spiteful Banditry Storm of Saruman The One Ring The Watcher in the Water Tom Bombadil Witch-king of Angmar Serialized Realms and Relics Cards The Party Tree Elessar, the Elfstone Bridge of Khazad-dm Argonath, Pillars of the Kings Three Rings for the Elven-Kings Morgul-Knife Herugrim, Sword of Rohan Ring of Barahir Shards of Narsil Balin's Tomb Barrow-Downs Isengard, Saruman's Fortress Minas Morgul Meduseld, Golden Hall of Edoras Paths of the Dead Weathertop Glittering Caves of Aglarond Green Dragon Inn Bag End White Tower of Ecthelion Osgiliath Fallen Capital Dol Amroth Redhorn Pass Bucklebury Ferry Inn of the Prancing Pony Henneth Annun Helm's Deep The Dead Marshes Valley of Gorgoroth Fangorn Forest Do LotR Special Edition Collector Boosters Have Cards from the Original Set
Notable, this is a $19 drop compared to what Avacyn typically sells for
Seedborn Muse and Sting, the Glinting Dagger are good options to untap Alaundo on your opponents turns, but cards like Kiora's Follower, Vizier of Tumbling Sands, and Seeker of Skybreak help you untap Alaundo multiple times on your turn to chew through those suspend counters
