Innistrad: Midnight Hunt/Trivia

Maro's Midnight Hunt teaser

Mark Rosewater gave his traditional teaser with the following hints.^[1]

three popular mechanics previously seen on Innistrad return — Flashback, _ and _
a new drawback for creature tokens that lets us create them cheaper —
a white card that could potentially draw you a card each turn —
a popular Innistrad card gets reprinted — Unruly Mob
a curse that transforms into a creature —
two permanents that can double something every turn —
a mythic cycle with “you may pay [COST] any number of times” —
a four mana blue aura with “You control enchanted creature.” —
A popular tournament card in multiple formats gets reprinted with its fifth piece of art. —
a character from Innistrad once mentioned in a short story finally gets a card in an Innistrad set —

“If your life total would be reduced to 0 or less,” —
“This spell costs 1 less to cast for each creature you attacked with this turn.” —
“As [CARDNAME] enters the battlefield, note your life total.” —
“put a slime counter on up to one other target creature.” —
“Creature tokens you control lose all abilities and have base power and toughness 3/3.” —
“Each instant and sorcery card in your graveyard has” —
“Instants and sorcery spells you cast cost X less to cast, where X is [CARDNAME]’s power.” —
“put that many +1/+1 counters on [CARDNAME], then create twice that many 2/2 black Zombie creature tokens” —
“At the beginning of your end step, if you have exactly 13 life,” —
“You may cast any number of the copies without paying their mana costs.” —