Ok, time for some new composition that is more in line with the recent disgus... cough cough... MantiBoreBone team.
Here is a quite good PVP team for starters: Dark Servants.
The team operates with low rarity cards but with a good efficiency that mimics the potential for skull damage that you can find in the higher level recent meta with Manticore/Manticore/Deep Borer/Bone Dragon. (Of course it lacks the Mana Drain, Attack Increase and Impervious from Manticore, but if you have Manticore and can trait it you are fine using it instead of the Stone Golem.)
Card's gameplay, mechanics and traits required/suggested:
Golem is an old favorite of all beginners. Good effect for low mana cost and traits that helps him in his role as a tanker. While in the current meta we see Bone Dragon removing armor of one target and generating a lot of skulls we aren't too far from it by simple using Golem's spell to reduce all enemy's armor while exploding a gem that helps to get some little mana for the team and maybe setup some cascade. He can't get extra attack like Manticore, but he is already making all enemies squishy for incoming smashing.
Traits: With two traits your Golen is good to go, but getting the last trait while not essential is good to provide extra mana for him in this team.
Skeletons are here bringing a lot of bone rattling. With their spell they will provide the skulls you need for your Golem's hammer time while also gaining some armor and not losing your turn, wich is very important because having some random skulls in the board could be dangerous. But don't worry too much about it if your Golem have Stoneskin. Golem is here to tank damage and leaving skulls on purpose is a know tactic to mislead the A.I that could cast a spell much more troublesome than a single skull match.
Traits: Having only the first would be ok for the extra life they get, the rest of the traits are not very important, but if possible Reinforced would be something fairly good in a situation where you lost your Golem and your Skeletons are supposed to tank the damage. Well, have in mind they are in this position exactly for that since they gain armor while providing skulls they can keep up a good fight for a while.
Dark Maiden: I'm really loving this lady in some of my low-level/prototype compositions. But damn, how wouldn't someone love her with such nice direct and indirect effects? As long as there are yellow gems she will work as an all colors (except yellow) converter. There is a lot of possible board manipulation using her, and all of that paired with a healing effect for the first troop, in our case Golem, wich increases his survival a lot. But again, assuming the worst case where you lost your golem you can still count with your Skeletons that are gaining armor and generating skulls without losing your turn and now they can also gain life from Dark Maiden.
One of the downsides of using converters is that sometimes you will ran out of the gem color you need to convert, but as long as Golem is exploding gems, and the Skeletons are generating skulls, that will be used from one side or the other, then you have a cood renewing cycle for the board with new yellow gems dropping by eventually. Also worth to mention is that you can loop Dark Maiden at least twice if you have yellow gems surrounded by green or red gems, generating a lot of health for the first troop.
Traits: You basically need her first trait to get some extra green mana to help her, but Cursed is a good trait too, so get it if possible.
Banner: I choosed the Zul'Kari Banner (Purple/Green) because i want to provide extra green for Dark Maiden in order to cast her spell faster and to get mana for the others. Extra purple to help the Skeletons too because they don't get any extra mana from traits and their spell demands ten manas, so it balances out the team to my taste. Also it fits my "theme" with the Dark Maiden leading her minions into battle for Zul'Kari's glory. (That's why the team was named as Dark Servants, also skeletons, golem and a dark elf/spider girl so... duh... they are all usually servants of darkness.)
Some considerations: As said before the team just mimics some mechanics of MantiBoreBone's team, but no Mana Drain, and not so resilient to status effects. But you are free to use this concept and come up with your own version. If you have Manticore fully traited you can just use it instead of Golem, you won't remove armor anymore but it's very well compensated for the attack gain, Stun (disabling traits that reduce skull damage) and Mana Drain from it's spell. (And two Skeletons should work fairly well if you still didn't got your Bone Dragon.)
Also, you must note that Manticore and Dark Maiden share some problems regarding mana, because both are green and Dark Maiden will convert the yellow manas that Manticore could use. So changing to a "Double Green" banner, and taking advantage of the fact that Dark Maiden has Nature link to generate extra green mana, while aiming to convert yellow into green would help you with this version.
But if you still don't have Manticore you could use Spider Queen instead of Golem, she has Leader as her first trait and it makes her start the battle with +3 in all status while in first position. Her spell drains mana and webs the enemy while also removing armor. The problem are her mana colors being Green and Purple because she would cut mana for the Skeletons and the Dark Maiden, if you plan on using her i would suggest using the "Double Purple" Banner, but the "Double Green" probably works too, in order to get much more purple for the Queen and the Skeletons when using Dark Maiden's spell. For this tactic collect red mana as soon as possible for Dark Maiden.
I guess that's all. Long post but i hope it helps someone.
Video with the team being used on PVP: Gameplay video
No voice and the sound changes a little during the video.
In the overall i've made a few mistakes, (on one move i did at 10:28 that allowed Crinsom Bat to make an "L" with blue gems and cast his spell, he was really close anyway, so i was trying to get new gems on the board by allowing him to get an extra turn to fasten the process) but i'm still adapting and getting better at using this composition.