They should usually be (much!) lower after release, but since many of these cards will be sought-after collectibles and some will likely be bought by FF collectors that have no interest in ever playing Magic there's no way to know the final price
You get to pay one mana to put a creature into play and give it haste, but you do have to sacrifice that creature at the end of the turn
You can tap a huge board state of creatures to pull all the lands in your library onto the battlefield tapped with Harvest Season, and infinite token generation mills out all of your opponents thanks to Altar of the Brood
Ritual of Soot Theres not much to say about Ritual of Soot except this sweeper is vital for both Golgari- and Dimir-based midrange and control decks moving forward
Tidus & Yunas Bant deck rides a wave of +1/+1 counters and tempo plays, keeping opponents guessing, and Yshtolas Esper spellslinger rig snaps off instant-speed counters, card draw, and removal
You only have to pay energy after they block, and unless they have tokens to feed you, theres some inherent risk in blocking