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Then Skylords Reborn has good news for you! Alone in the nature/fire department you have more archetypes of decks than ever you can explore (Abo-Spell, Evil Eye spam, Evil Eye spells, unit based T4 mix and a few more non Twilight decks like the above shown or the good old Thunderwagon/Dragon)

Some of these decks are new in SR and some got stoooong buffs due to changed cards.

Hey,
 
this one may be a little beyond your budget if you take the whole deck, but if you leave out the Clusters for the beginning, you could go with something like this:

If you go for a green T1 and therefore can drop the Mine, you should be able to build the core of this deck in less then 2 days. Cluster purple is inferior to the red affinity, but can also fill a slot in mid term
 
 

Hey, welcome to forums! 🙂
 
Here is something to cover Nature T1 but could also serve as an alternative: 
 
 
Yeah, out of the box that got Shadow in it but I feel core of deck is  (Lost Horror G is quite nice but if you absolutely don't want Shadow then Swamp Drakes by itself, unit wise, with support of Stone Shell G + Equilibrium G does the job too). Personally, I found Offering to be super helpful when I was starting out and for rPvE 9, I would recommend working in a Furnace of Flesh for the rare occasions where no one else has Shrine of War (replacing Nercoblaster is my 1st choice if it is for rPvE).
I have done  variant for "fun" (Shrine of War at T3 and Bloodthirst and Cluster Explosion at T4) so I think that can easily progress towards what Volin said above but you have a lot of choices really.
 

Heya,

wanted to share a deck again that is currently a great fun for me and as it is also quite beginner friendly I think it's cool to post it here. The only really expensive card in my current setup ist Cluster Explosion (red) which can be replaced with just another dmg spell or a T2 unit for low budget.



Just made this a few days, looks so far as 3 heals (plus Unity) could be a little over the top, so feel free to cut Equilibrium. The latest buffs of Inferno and Fire Sphere make this really fun to play and the alltime classic Thunderstorm and Cluster compliment this well.

Mandatory are in my eyes:
- Oink for at least a little CC (time buyer and help to get T4)
- Unity BLUE! (Fire Dragons get quite tanky with a Grimvine in a Unity)
- Regrowth and Bloodthirst
- above mentioned 4 dmg spells, feel free to add more
- Grimevine (nice, cheap all time classic, a great tank for just a few bucks)
- Shrine of War (build 2, you need constant void return to use ur spells all time)
- Inc Mo (needed if you want to utilize your Dragons against Lost Souls, use the Yellow one, else the green is always handy)

Handy but optional:
- Breeding (your partner may appreciate that)
- Revenge is more a filler but always nice to have and a good supporter
- 3rd heal

T1 or
classic Fire or Nature start
T2
Feel free to add a T2 unit of your flavor, usually both T1 colours deal perfectly fine with any T3 enemies with the help of Oink
T3
Usually here you want to build your Shrine ASAP. If needed get some Hurlers out, together with your spells and Unity they are really a force.
T4
Get a Grimvine out and go ahead, it is mostly just the ground presence for your spells. Once you have plenty energy feel free to add some Dragons as they are superb boss killers. Play Bloodthirst in advance before you engage camps, if there are Windhunters or other paralyzing units Oink them for a few.

Don't hold back with your spells, if you activate your Shrine you can play them endless and let Fire and Thunder rain on your enemies!



 

My first “primary” rPVE was also a Fire-Nature-deck with no Twilight. It's simple, it's fun, and it's very forgiving when you make small errors.
10/10 for Twilight with no Twilight 👍

Used to be my go-to in the EA days, since I hated actually playing Twilight cards, which in my opinion sucked badly 😄
It is better these days, but I still prefer mostly non-Twilight stuff.