The rares (and for Unstable , mythics) of Un-sets work the same way, with a twist: demand isn't based on playability, since none of the cards (discounting the black-border Steamflogger Boss reprint) are tournament playable
Opening a Collector Booster might be exciting, but it does not teach you the game
There are a bunch of options, really, from Baleful Mastery and Infernal Grasp, to Price of Fame or Dismember
It'll be interesting to see how players brew with the card, which is also in a color in Black that doesn't often get new land synergies that are intriguing
You untap lands, along with other permanents like creatures and artifacts, during the untap step, before your upkeep
Summoning sickness does not automatically tap the creature, so haste wont untap it