Fire Spirits: are a must because they can be a good counter against Skarmy or Minion horde.
Minions: Can be replaced by Skarmy.
Ice Wizard: Can be replaced by musket or wizard, but good for spamming and both offense and defense.
Valkyrie: Can be replaced with Bomber, but still very powerful. Good counter against spam and swarm.
Arrows: Arrows are a great counter for minion Horde and swarms. Can be replaced with zap or tornado, both which I would recommend for cheaper options.
Mirror: Big part of spam.If higher areana, can be replaced with clone.
Spear Goblins: Are main power in reinforcing the deck. Can be easily countered with spells, but still a good defense and offense.
Mini Pekka: This awesome card can be replaced with Pekka for a 3.0 elixir deck. I recommend the mini pekka, though, because it is very powerful, especially reinforced by other troops. I would use the Pekka in some cases, but if you want an efficient push, then the mini pekka is the man(or woman). Also, the deck is still cheap in elixir cost.
Offense and Defense:
This can be used in a variety of combos. For offense, I would put Valkyrie, Fire Spirits, and pekka. If there is still elixir, put down ice wizard, and prepare your minions or goblins for counter.
Another good combo is to place 2 ice wizards and a Valkyrie. This will provide you power and area. Put Fire spirits or Spear Gobs for obackup.
For defensive, I would use pekka only in the most desperate cases. After all, it has some help from the areana tower, so it can now counter witch. Otherwise, i would use minions and spear gobs to block against tanks, and use ice wizard and minions for balloons. Valkyrie can be handy with Barbarians.
Strategy: There are a lot of starting hands for this deck but I like to use the spam ice wizard one. First, put down an ice wizard and mirror it. Since you have cheap cards, you can cycle these cards in no time at all. Just cycle back until you have ice wizard and mirror and do the same thing. Remember to prepare arrows for minion horde or skarmy. By the time you reach halfway, you should have 6 wizards on(depends on the cycle).In this case, put a pekka or mini pekka in behind. The reason you want to is because the tower will target the ice wizards and not the real tank here. If you have enough, also put Valkyrie or Fire Spirits, because the ice wizards don't have that much area damage. Don't rush, or you'll regret it. just go with the flow and watch your opponent get DESTROYED.
Final Words: Okay, truthfully? I'm not that good. Although I have all the cards I mention in here, I am only in areana 6. This deck has helped me, though, and I hope it will help you, too. I know this deck won't always turn out as you want, but keep practicing. If you don't want to risk losing many trophies, practice with training camp or friendly battles.
Oh, also one more thing I didn't mention. When dealing with spam decks, don't panick. It's useless to try and push., so just push on the other lane, and keep defending the spam lane at the same time. As for building decks, try using swarms or tanks.
Well, that's it for now, guys. I will try to come up with new decks, and I hope you enjoy this one! Try using mini pekka, and it will give you a greater opportunity to spam. Keep these tips in mind, become a boss, and I will see you later.