
In Shadows Over Innistrad, Cloudhoof Kirin got a boost from a new Spirit, Rattlechains, and a new mill card, Startled Awake. Rattlechains allows you to play any of your Spirits at instant speed, which makes Cloudhoof’s ability that much better. Startled Awake can return from the graveyard transformed as a Persistent Nightmare, which then returns to your hand after it deals combat damage. While it's not the most efficient spell, it's reusable.
Here’s a sample decklist you can build from.
Commander
1 Cloudhoof Kirin 3uu
Creatures (37)
1 Dreamcatcher u
1 Kami of the Crescent Moon uu
1 Mindshrieker 1u
1 Rattlechains 1u
1 Shape Stealer uu
1 Shapesharer 1u
1 Shriekgeist 1u
1 Drift of Phantasms 2u
1 Kira, Great Glass-Spinner 1uu
1 Lantern Spirit 2u
1 Niblis of the Breath 2u
1 Riddlekeeper 2u
1 Sage's Row Denizen 2u
1 Dreamborn Muse 2uu
1 Dungeon Geists 2uu
1 Phyrexian Metamorph 3up
1 Rushing-Tide Zubera 2uu
1 Sakashima the Impostor 2uu
1 Shimmering Glasskite 3u
1 Solemn Simulacrum 4
1 Soulsworn Spirit 3u
1 Tower Geist 3u
1 Tradewind Rider 3u
1 Battleground Geist 4u
1 Kiri-Onna 4u
1 Quillmane Baku 4u
1 Soul Seizer 3uu
1 Sturmgeist 3uu
1 Teller of Tales 3uu
1 Deadeye Navigator 4uu
1 Keiga, the Tide Star 5u
1 Sire of the Storm 4uu
1 Soramaro, First to Dream 4uu
1 Tomorrow, Azami's Familiar 5u
1 Patron of the Moon 5uu
1 The Unspeakable 6uuu
1 Myojin of Seeing Winds 7uuu
Spells (24)
1 Tormod's Crypt 0
1 Personal Tutor u
1 Reach Through Mists u
1 Relic of Progenitus 1
1 Sol Ring 1
1 Consuming Vortex 1u
1 Counterspell uu
1 Dampen Thought 1u
1 Disrupting Shoal xuu
1 Eye of Nowhere uu
1 Psychic Puppetry 1u
1 Sapphire Medallion 2
1 Stream of Consciousness 1u
1 Veil of Secrecy 1u
1 Eerie Procession 2u
1 Jace Beleren 1uu
1 Rhystic Study 2u
1 Sift Through Sands 1uu
1 Toils of Night and Day 2u
1 Startled Awake 2uu
1 Jace, Memory Adept 3uu
1 Petals of Insight 4u
1 Ribbons of the Reikai 4u
1 Reweave 5u
Lands (38)
1 Halimar Depths
30 Island
1 Lonely Sandbar
1 Myriad Landscape
1 Nykthos, Shrine to Nyx
1 Reliquary Tower
1 Remote Isle
1 Shelldock Isle
1 Temple of the False God