The first Headliners, Edgar Markov in Innistrad Remastered and The Aetherspark in Aetherdrift , were serialized with unique art, so if the 77 golden chocobos in Final Fantasy are any indication, Headliners will be serialized when WotC has a good reason to
Prerelease packs will be shard-themed with 5 regular draft boosters and 1 seeded pack that contains more cards in the color of your chosen shard
For example, if I'm building an aggressive Black-Red Vampire deck that wants one-drops, I'm definitely including four copies of this card: Once again, the power of a 2/1 diminishes quickly as the game goes on
Now, wed like to explain to you what each rarity is as well as the specific features of cards of both rarities
Headstone is a rather interesting one, tying in with the flavour we've seen with Bone Shaman in Ice Age where 'properly' doing funerary rites prevents a creature from being resurrected as an unholy zombie