There's little list of cards, that ain't too good choices for constructed. It's purely subjective, based only on my opinion and experience, and only true for constructed format. And maybe they're fine as they are, but still...
Carrion Feeder:
Although it got flying, which is very useful to DL, that card needs whole lot of turns to gain any significance on field. In other words, simple zombie is more useful in most cases.
Oh, and there's 1 flux needed to use it's ability
.
Maybe something like: "1-2f, carrion feeder loses aloft until begining of next round" would be more appropriate. And something like "when Carrion Feeder has 6 or more +maxhp counters, it loses aloft" in addition.
Dag Cannon:
It costs 8 flux. And it's slower than dead slug enchanted with entangle. Surely, it does volcano. But it does it only on other turn, only in range, and it costs like two volcanoes(and no free mountains there). I don't know what exactly can help this card. Reducing its cost and damage and/or changing its reload mechanic might do the work.
Hadth, Drill Sergeant:
He isn't bad creature by himself, battle ready is powerful ability. Byut his activated ability is sorta useless. And more, it's easy to make mistake and give enemy creature battle ready instead of hitting it
So removing that ability entirely wont hurt. Or, maybe, give him some aura-like ability instead (adjacent/in sight dwarves/creatures gain small/even smaller bonus) he is drill sergeant, after all
Lava blister:
It ain't to useful in late game. Maybe after reducing domain cost and raising flux one it might see some play.
Light of day:
While its effect is pretty good, still it sounds more like cantrip to me. So, "draw a card" won't hurt.
Mountain blessing:
Who needs heal(2) at three domain enchant creature? Especially if you can cast rune of shielding instead
Rithig, Titan Pariah:
5 domain, 6 flux, 3 move and he needs close contact to do any damage. Kicking buildings around is fun, but still, this creature is useless, your opponent probably will hoard 40 glory before that titan starts annoying him.
Tortured Ghost:
3 domain, 5 flux. And it's only slightly better than Dire Cave Cricket. Let's say that DL got many better 3D creatures to cast with roughly same flux cost.
Twisting Intentions:
For 2E and 3 flux you can copy card that you already got. Or you may just cast that card bit sooner and save money on other rare. Seriously, that cost is more appropriate for a tutoring any card from deck.
Vines of Dellen:
Oh yeah, Sylvan version of Iron Gate, with blackjack and hookers. I must admit, this card is really ODD.
Water Weird:
This card got really scary art >_>. I understand, that its main purpose is revealing point for Chambered Reef and catсhing ballista bolt from that fancy elvish boat, but... Can it have range 1, or fear(1), maybe?
Woodland Link:
Drawing a card for 2 flux is pretty good. But situative drawing, which requires 2 domain, when you just can cast Call To Battle instead... Still, it might be useful, but what if that card was: "enchant your creature with 1 or more current HP, if that creature is destroyed, draw 2 cards and return Woodland Link to your hand"? It's more than drawing.
Oh, and sorry for my ugly english