I've made a card blog for every entry in the first contest... that's still on the site. You can find them here.

Also, here's a breakdown of what goes with what:

Mirror Summons: Princess Cadance's Official Princess Harem of Imported Humans from Another World
Prarie Haka: A Crown of Blood and Iron
Altar of Old Stone: The Principal's Project
Celestia's Legacy: Why There Are So Many White Unicorns in Equestria
Crystal Ruins Expedition: The World Fades to White
Questing Princess//Persevere: Pumpkin's Big Adventure
Tyrannical Temptation: Unhinged, Debt (Or: Trial by Fire)
Political Puppetry: Respect and Respectability
Walls of Fort Libris: An Orderly Transfer of Power
Procedural Approach: By the Book
Eidolon of Sorcery: The Timestone
Canterlot Defenders: A Canterlot 'Mending
War of Ideas: Crystal Glass Ceilings
Willing Delusion: The Perfect Rule of Princess Flurry Heart
Imperial Claim: Sleep
Bitter Betrayal: Little Truths
Nightclub Diplomacy: Snowblind
Puparia's Guidance: Motherly
Changeling Successor: The Honing of Perfection
Dark Reign: Waxing Gibbous
Arawn, Lord of Blood: A Song in the Dark
Suncrystal Flameblades: And a Sky Full of Stars
Regal Bloodseeker: Noblesse
Eternal Struggle: Stay Determined
Watch it Burn: When Canterlot Burns
The Minotaur King: Evil is Easy, Governing is Harder
Ruinous Fire-Serpent: The Princess Fair of Everfree
Numerical Advantage: Flurry Heart's First Kiss
Terraform: Flurry's Star
Twilight's Perambulation: The Road Goes on Forever
Apple Family Debtor: We Must F*** to Survive!
Luna, Mistress of Spycraft: Obiter Dicta, The Other Princess
Cunning Optimist: Ember, Hoardsmelter
Gala Stampede: Princess Celestia's Best Night Ever
Sunset, the Dichotomy: The Last Sunset
Macintosh, Vox Populi: An Apple a Day Keeps Autocracy Away

And a batch for the second round, found here. Here's the detailed guide:

Burden of Responsibility: Shedding Her Shell
Harmony’s Guidance: Battle of Canterlot: I Want to Break Free
Solar Judgement: After the Flood
Self-Petrification: Heavy Lies the Head
Price of Victory: Even a Victorious Battle is a Terrible Thing
Ponkamancy: Twilight’s Secret Shouting
Four Winds Guardian: The Last King
Alliance Commander: A Dream Coronation
Delegate: Murder Most Fowl
Sparkle Acolyte: Worshiping at the Altar of Knowledge
Pass the Torch: Miles to Go
Peel Back the Veil: Royal Flowers
Lost Scion of Griffonstone//Gallus, Prince of Prosperity: PRINCE GALLUS? And the Trial for the Throne
Lethemantic Arrest: To Be Kind
Scream into the Dreamscape: Sunspear
Amore’s Scorn: Her Crystal Throne
Lunar Influence: In the Moon’s Platinum Glow
Pretender to the Throne: Princess Trixie of Transylmaneia
Soul Sacrifice: What it Means to Rule
Corrupt Regent: Seneschal
Mount Aris Avenger: Silverstream’s Raiding Party
Void-Gaze Watcher: Waning Crescent
Sombran Revivalist: One Night’s Rest
Arrogant Conqueror: Fit for a King
Executioner of the Realm: The Exile’s Keeper
Pot of Hemlock: Afternoon Tea and Games
Umbrum Legion: The Heart Beats Still
Chrysalis’s Audacity: This Coup is Going to be Perfect
Inevitable Betrayal: A Trolley Problem Named Desire
Forge Dancer: Phoenix-born rising - the ascension of Sunset Shimmer [1st ed.]
Hinndian Insurrectionist: Bound by Duty, Led by Love
Discord, Clown Prince//Discord, Avatar of Chaos: The Rise of Chaos
Flarewing Sniper: The Broken Treaty
Dragonlands Diplomat: Pony Peace is Dragon War (Diplomatic Dragon Noises Included)
Sisters’ Bond: She Kills Monsters
Whitewing Commander: War Games
Retroactive Incarnation: From Discord Comes Harmony
Ring of Canterlot: I Vow to Thee, My Country
Storm King Fragment: Seasons
Yakyakistani Rocket: For the Benefit of Yaks
Astral Orrery: Sister Solstice
Joy Hive Guard: The Joy Hive
The Bloodstone Crown: Fang and Flame
Harsh Assessment: Inward Eyes Wide Open
Elope: Run Away With Me
Luna, Wirespace Princess: Souls and Silicon
Cathedral of the Moon: Lest We Forget

And, as is by now traditional, here's a batch for the third contest. The guide follows:

Blinding Convergence: When the Stars Are Right
Control the Narrative: Pegasi Pillow Talks
Love Sickness: Resolution of a Queen
Hovering Guardian: Flitterblocked
Majesty Guards the Herd//First Queen’s Legacy: Twilight Sparkle’s Majesty
Seraph, Arbiter of Harmony; Child of Harmony
Growing Distrust: A King of Infinite Space (Disqualified, but still very good.)
Royal Redistributor: Finding a Haven
Reassurance from Beyond: A Thousand Little Somewheres
Pact of Eternal Night: Night Court
Grim Janitor: Sorry (Seems To Be The Hardest Word)
Anxious Worker: The Power of Love
Dark Gambit: If I Should Falter
Dramatic Return: Riding the Void
Hope’s Betrayal: The Endeavor Within
Curse of Unbearable Burdens: Chained to the Plow
Hypoglycemic Interlude: Tales of the Celestian Days With(out) Cake
Gattai!: Gattai Ryūjin Ponizenon
Misplace: Long Live the Sovereign
Teahouse Sharper: A Little Bittle of Sunshine
Grovesoul Kirin: Sow The Wind
Seductive Algorithm: Sunset Shimmer Meets the Last Woman on Earth (Sunset Discovers the Robot Apocalypse)
Fungal Queen: A King and Queen of Infinite Space
Trial of a Thousand Blades: Princess Luna Wants A Sword
Conflicted Sociopath: And I Hope You Die
The Blizzard of Paradise: The Tyrant Within
Mnemonic Seal: Secrets Forgotten
Manufactured Drama: Encore!
Inscrutable Badalisc: In Night’s Garden
Temporal Resonance: The sister she never knew
Magus of the Bell: The Final Emperor of Equestria

The tradition continues, with the fourth generation seen here. Here's the guide:

Love Song of Hope and Faith: Devotion’s End
Unicornian Border Guard: Platinum Moonlight on Snow
Bomber Thopter 82: Children of Darkness and Light
Curse of Solemn Duty: In the Shadow of the Sun
Terran Ghost: A Ghost and a Commander
Insistent Contrarianism: Vice
Inquisitive Harpy: The Weight of Knowledge
Snails, Gastropod King: The Piper at the Gated Lawn
Longing Dreams: Awakening
Deathly Pall//Plutonia, Princess of Death: Till Death Do Us Party
Spin Control: The Queen’s Speech
Consumerist Nightmare: Diamond of the Dead
Flora Da Mare: The Empress of Storms (Rainbow Dash vs. Hurricane)
Deserter’s Execution: Might Makes Right
Lèse-Majesté: Counting Noses
Totemic Pyre: Come Rain or Shine
Case of the Sabotaged Sweets: Don’t Let Them Eat Cake
Hard Bargaining: Don’t Take No For An Answer
One with Magic: The Dream-Armageddon of Nihilist [remember to insert cool made up name here]
Uplifting Duet: Oral Pleasing is the Law
Altar of Renewal: Liquid Gold
Harbinger Titan: Bionic Titan: Operation Damocles
Threaten the Creche: To Do Right
Oath of Tonatiuh: Twilight Sparkle & The Martyr Of Zephyr Mountain
Insistent Overseer: We Persist
Sour Sweet, Grindbone Heir//Sour Sweet, Grindbone Alpha: Cry Wolf
Unstable Simulation: Post-Credits