Individual card changes:
Intuition is unbanned.
Recurring Nightmare is unbanned.
Further individual explanations:
Intuition has been banned a long time ago because of its ability to assemble powerful combinations, notably with
Life from the Loam. Considering the global acceleration of the format, this type of setup has become much harder to assemble. Intuition can be useful for several minor archetypes, which will promote this format's diversity.
Iconic Magic card,
Recurring Nightmare has suffered a lot from its legendary past. Today, Recurring Nightmare remains a very powerful card in many decks, but it has a power level that seems acceptable as not being a threat to the format. Indeed, black already has efficient ways to bring creatures back from the graveyard, without getting degenerate.