If you pay the blitz cost to cast a creature spell, that permanent will be sacrificed only if it's still on the battlefield when that triggered ability resolves
The reasoning behind this is quite simple
All the cards from a given set are printed on identical printers
Depending on the set, finding them may be as trivial as tripping over them on the sidewalk or as difficult as having to attend a session at Sothebys
Again, it's way too early to give any judgment on any of these cards, but there's still one that stands out to me that people don't seem to be talking about a lot: Monk GyatsoMonk Gyatso
Fang, Fearless l'Cie #99 Final Fantasy Change Version Fang, Fearless l'Cie Legendary Creature Human Warrior Whenever one or more cards leave your graveyard, you draw a card and you lose 1 life