Rosewater occasionally releases text previews of upcoming cards and mechanics, old school Duelist magazine-style, on his blog. The partial information revealed gave players a few hints as to what's in store for them as spoiler season kicks off. He started off by listing some mechanics and features on cards in this set:
- a new enchantment subtype
- a card granting -11/-11
- a creature with a death trigger that make an equipment token
- a legendary creature that makes a legendary Hamster creature token
- something only seen previously in Un-sets comes to black border
- an artifact that’s a musical instrument that creates harmony counters
- a card that can keep your opponent from winning the game
- an ability that cares about attacking with a certain amount of power of creatures
- cards that let you decide where the story goes
- a card that creates a legendary creature token named Vecna
- “Enchanted permanent is a Treasure artifact”
- “Ward – discard a card.”
- “Exchange your hand and library”
- “Skeletons, Vampires and Zombies”
- “Spend this mana only to cast Dragon spells or activate abilities of Dragons.”
- “for each different mana value among nonland cards in your graveyard.”
- “Then if you have fewer than three cards in hand, draw cards equal to the difference.”
- “Whenever you cast a creature spell that doesn’t share a creature type with a creature you control or a creature card in your graveyard,”
- “You may cast [THIS CREATURE’S NAME] from your graveyard if a creature not named [THIS CREATURE’S NAME] died this turn.”
- “When its power become 20 this way,”
As for the creature types, Rosewater mentioned the following:
- Creature – Dwarf Citizen
- Creature – Tiefling Wizard
- Creature – Human Elf Monk
- Creature – Elf Spider
- Creature – Gnome Warlock
- Creature – Halfling Rogue
- Creature – Bird Bear
- Legendary Creature – Dragon Knight
- Legendary Creature – Devil God
- Legendary Creature – Beholder
Additionally, WotC released a few new cards from this set via their news site. This spoiler included the first glimpse of what Dungeon cards look like and do. Dungeons are new card types that start outside the game in the Command Zone, and can be triggered by cards with the keyword "venture". Each venture trigger moves players through a room in the Dungeon, starting with first, till it is completed. Once a Dungeon is completed, it is removed from the game, but completing a Dungeon may provide additional benefits to certain creatures. Players can have access up to three Dungeons, but only be in one Dungeon at time.
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