Emeria is pretty powerful, and is a great reward for a white-based list that can make it to the late game. No matter how fast my format is, it's still prone to stalls as players build up the necessary resources to push through each other. That's where Emeria shines; breaking late-game stalls, which imho is something everyone needs to consider when shaping their lists. So far, Emeria has been picked and played as a Plan B in a list that never needed the effect to win, but I'm optimistic so far about its potential to slowly dig a player out of a stalled board and pressure the opponent to act faster. Note that we're prone to 2-colour decks and decks that have a clear pillar colour (ie 65%+ of cards are the main colour) here, which makes Emeria much better; if your drafters are mostly 4-5colour goodstuff, then it will be shite. I like reward cards like this, though, so it's an easy card to keep on the list for us.
Bloodhall hasn't seen play yet, but I'll be drafting again later today and I'll try to force BR Grindfest, which is where Bloodhall wants to be. I don't have high hopes for it, but so often games can durdle out (see: Emeria, above) and I've seen
Grim Lavamancer win those games. My hope is that the great Bloodhall might provide a plan B for grinding out while the BR player is in topdeck mode and drawing 4 lands in a row, but I'll report back conclusively as soon as I can, it could very well just be clutter that never gets used.
I've picked Maze and been pleased in similar situations (re: re: boardstall) already using a really, really mean UB midrange beats deck that had a really sick lineup of
Aether Adept,
Sower of Temptation,
Dungeon Geists and
Icefall Regent to lock up the board, and the Maze helped to keep me safe in the final turns in a race. It seems like a reasonable pick for midrange or control strategies. I find it a fair effect, since it allows a re-use of opposing ETB effects while also offering a way to eat token builds, and I'm big on "fair"-feeling value cards like this. I recommend it for anyone at or below my power level, it's definitely worth a spot imo.
EDIT: Maze also works great as a "threat of activation" effect, causing your opponent to pass combat assuming you will use it when you have the mana open. You then eot an instant and watch them stare directly into the camera like they're in The Office.