Let's take a deeper look shall we. Bruxa is very below average. A four point card which can gain thrive but requires a deathblow to do so, seems unlikely to ever be used.
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Bruxa is another card of the Wolf Pack clones, which are welcome in all factions, although this is the worst among them, given that it becomes no better than the original when hit by another one of these, the others (especially SK and NR) are safer value, not relying on surviving and if I want to play a point/provision = 1 card I would propably rather plya Wyvern and Drowner is also leagues better (not just 1 point, given its versatility).
Nevertheless this is one of the better additions to Monsters as a filler in case you have no really synergies among your 4 provision cards.
[...] Alp is a base 5 with potential for 7, not that low value. Plumard is a base 5 with potential for 7, also synergizes well with deathblow. [...]
The first one completely depends on how Bloodmoon turns out, based on that it is either alright or plain awful.
The second one is an immediate 4 with 1 more after 1 turn and in case you have yet another copy of this 4 provision card and still failed to mulligan either of them away you get punished less by getting up to 2 more points, in case the Round continues for that long.
Also setting up for deathblow takes an awful lot of turns dwidling one's thumbs, given that if you interfere bleeding gives you less value and using this to set up deathblow 1 is a play even beginners can smell from a mile away and somewhat easy to interfere, in which case the deathblow unit becomes a nuisance, rather than a combopiece (especially Gael, if the opponent interrupts the setup Gael becomes a non-control 5 points for 7 provisions card you set up for, which is the stuff of nightmares for the person playing him).
[...]Feast of blood, base six, synergizes with deathblow, removes beneficial effects from enemies, this card works well with deathblow, but depends on provision cost (it low it is a good card, if high not a good choice.) [...]
Feast of Blood takes forever to get the provision cost in points back and only brings that many points in case you first find a really large unit (unlikely unless you face Monsters) and then proceed to wait 4-5 turns, just to break even.
[...] Nekurat is an engine with great value (at least 2 points every 2 turns, and demands enemy lock/removal.) [...]
Nekurat is an objectively worse version of Johnny (which about noone runs outside of memes), it has less shots (Johnny comes with 1), is just as reliant on targets, is just as easily removable (same stats, both pointwise and provision-wise) and uses a subset as trigger (Johnny works with all Special Cards and not even that is true for Nekurat).
If noone runs Johnny, why would they run Nekurat ?
[...] Lastly fleder is a base 3 potential 7 card which functions like a 1 point smaller Griffen, except it is worse for consumption and better for vampire synergy. [...]
Fleder does nothing for Vampires and works better for consumption than you give it credit for.
It can be used with an Arachas Drone on one's field and Queen immediately replaces it (just like Griffin).
It then immediately grows to 4 and proceeds to grow 1 point each turn, while Queen wants to either outvalue or force the opponent out, it only takes 1 turn to break even and the card at worst draws out a Chironex, so that your Chironex can then more likely stick for Unicorn. If the opponent does not remove it it becomes a 2 provision cheaper 1 point lower Griffin (though admittedly without the benefit of Ghoul synergy).
In fact Fleder is the by far best and only really good new card for Monsters thus far.
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I agree these cards by themselves are not a successful deck, but with new deathblow cards and with the more powerful vampires yet to be revealed, I am okay reserving judgement.
I am also hoping for the best, however they only have 7 cards left to add actual Vampire synergy, add at the very least some excuse to Nekurat's existence, add consistent Bloodmoon access (propably also the new leader) and a few Bloodmoon cards, add Bleeding synergy (they announced there would be cards playing around with the damage of Bleeding etc) to give an actual incentive to use it and potentially add an actually good Deathblow card.
Not to mention Detlaff has to appear either as a leader or unit (likely an unit, given that we will likely see a regular form and Higher Vampire form like with Regis [unless he transforms]).
Edit: So Gregoire de Gorgon is a Neutral card ... which begs the question why one would run Gael over him, he is guaranteed to exceed the point/provison = 1 threshold, has a Shield, can hit units without them being high, possibly even without the need for setup and is not good - > awful depending on the matchup).
In this case this might be one of the best cards in the expansion.