Playing a land always requires you to have a land drop remaining for turn, no matter what part of the turn you play it in
Each ultimatum is really its own payoffs, and most of them are easy to take advantage of in the deckbuilding process
In fact, I wonder if this might be too easy to turn on, to the point where you risk killing yourself since it's not a "may" ability
I was really surprised how easy and rewarding the experience has been and though I suppose I do miss some of the human interaction, overall I would say the experience has been very positive
Before we jump in, note that these rankings come from a cEDH mindset
Glasspool Mimic / Glasspool Shore Cloning your creatures with Glasspool Mimic already has lots of implications, especially in cloning EDH decks like Keiga, the Tide Star or Sakashima of a Thousand Faces