Innistrad: Crimson Vow/Trivia

Maro's Crimson Vow teaser

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

The following counter types:
- Bloodline
- Croak
- Invitation
- Judgment
- Omen
- Slime
- Suspect
A new mechanic that removes something never removed before
A popular and powerful creature card from an Innistrad set gets reprinted
A new artifact token, along the lines of Clue, Food and Treasure
A card that makes red Dragon Illusion creature tokens with flying and haste
A mechanic that first appeared as a faction mechanic returns
A new legendary creature card that combines two characters that previously each had their own legendary creature card
A new card that lets you cast certain cards off the top of your library
A new mechanic which is a mirror of an already existing mechanic
A legendary character returns, but now as a Vampire

“Choose a number between 0 and 13.”
“with mana value less than or equal to the number of Vampires you control”
“If it’s red, you may cast it this turn.”
“Zombies you control have flying.”
“At the beginning of your upkeep, any opponent may sacrifice a creature.”
“Kraken, Leviathan, Octopus, or Serpent”
“twice that many of those tokens are created instead.”
“Whenever a Human you control dies,”
“equal to the number of permanents you control that are Spirits and/or enchantments.”
“Then if you control exactly thirteen permanents,”