Time will tell if Duskmourn: House of Horror is the success many are predicting it will be

Abomination of Gudul Abzan Guide Ainok Tracker Akroma, Angel of Fury Aphetto Alchemist Aphetto Exterminator Aquamorph Entity Ascending Aven Ashcloud Phoenix Aven Liberator Backslide Bane of the Living Battering Craghorn Birchlore Rangers Blistering Firecat Bloodstoke Howler Boneknitter Branchsnap Lorian Brine Elemental Broodhatch Nantuko Cabal Executioner Canyon Lurkers Charging Slateback Chromeshell Crab Coral Trickster Crude Rampart Daru Healer Daru Lancer Daru Mender Daru Sanctifier Dawning Purist Defender of the Order Dermoplasm Disruptive Pitmage Dragon's Eye Savants Dulcet Sirens Dwarven Blastminer Ebonblade Reaper Echo Tracer Efreet Weaponmaster Exalted Angel Exiled Doomsayer Fallen Cleric Fathom Seer Fledgling Mawcor Foothill Guide Fortune Thief Frontline Strategist Gathan Raiders Gift of Doom Glacial Stalker Goblin Taskmaster Gravel Slinger Grim Haruspex Grinning Demon Haunted Cadaver Headhunter Hooded Hydra Horde Ambusher Hystrodon Icefeather Aven Imperial Hellkite Infernal Caretaker Ironfist Crusher Jeering Instigator Karona's Zealot Kheru Spellsnatcher Kin-Tree Warden Krosan Cloudscraper Krosan Colossus Krumar Bond-Kin Liege of the Axe

If you can get a reasonably high storm count going, you can eventually deal 50 to someone
It has beefy threats, but absent powerful ETB abilities, getting working hard to ramp out a Colossal Dreadmaw only to see it Pacified or Murdered is horrendous
These are basically a split card between a land and a spell (such as instants, sorceries, or creatures), and you can cast or play either side
The decks will sell for $39.99 USD each in the MTGO Store starting next Tuesday