About the Deck :

This deck right here is one of the most trending decks in Clash Royale with decent amount of Win-rate & this deck doesn't require a lot of Skill.
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What makes this deck best & sometimes impossible to defend?

Well let's break down all cards one by one & see why this deck works best !
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1). Hunter :

"Hunter in The Forest !!!!"
As you already know Hunter is one of the strongest card in the game, and it makes it strongest because of his different roles. Hunter works as an
  • Win Condition (Only Sometimes)
  • High DPS in short range
  • Can take out swarms (skeletons, Minions, Goblins)
  • Tank Killer
Now it's time imagination. 
Imagine that your opponent just drops a Giant & a supporting Wizard at the River & you just have to wait them to enter your arena & place your Hunter (Properly & Close) near the wizard who tries to support the Giant(Any other Direct attacking card) & Hunter with his ability to deal insane damage in short range, Wizard will  be instantly destroyed & you can use any other helping card to take out the Giant more speedily. This way hunter becomes a very powerful & must use card in Clash Royale.
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2). Royal Hogs :

"Not Hog rider, but Hogs right?"
Well Royal Hogs only work as a Win Condition & also helps in making split lane pressure to your opponents by just placing between the river & the 2 team of hogs will create a little bit of pressure & no one except the buildings stop hogs from reaching the tower. Many people ignore royal Hogs in place of Hog rider but as I mentioned royal Hogs can create split lane pressure & if all 4 hogs reach the tower they can actually deal more damage then a Hog rider. And that's why Royal Hogs has it's own special place in this deck.
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3). Log :

"I can wash away ground swarm & push any ground unit"
Okay So, I am thinking not to explain anything regarding log right? The Goblin Barrel, Clone Swarms? Right? Just use it.
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4). Royal Delivery :

"I will deliver myself in few Seconds"
Another card from the Royal Family. Royal Delivery is also one of the trending cards in Clash Royale. But what makes it "More used" & "Royal"?
Well Royal delivery is a Delivery package in which there's a Royal Recruit. Sorry for that😂. Okay, Royal Delivery can take out big amount of Swarm including Ground & Air Units. The reason why it's more reliable because it clears & damages Air Units as well. It works only as an Defensive card & also as I mentioned earlier Royal Delivery is a "Swarm Eater". The reason why it's a common card because you cannot deliver or throw it anywhere just like "Arrows".
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5). Earthquake Spell :

"Okay i it's sharking!?..a..ASM.s.aja..Earthquake.!"
Earthquake is a very powerful spell trending from a long time after it was nerfed last. Earthquake can work as a Win Condition & the combination with Royal Hogs makes it a really powerful card, because Imagine you go for Royal Hogs & you can use earthquake to easily takedown buildings & swarms like skeleton army or goblins. So, we have got a big spell "Earthquake" with "Log".
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6). Goblin Cage :

"I am stuck ! Let me Out"
The powerful Goblin Brawler is here! Well Goblin Cage is a fantastic defense card, but it's a building card. The reason why Goblin Cage is used in place of other defense cards like Bomb Tower or Tesla is that the Goblin Brawler's DPS is so high that if your opponent is not focusing/ignoring the Goblin Cage's Brawler. The Brawler can actually take out half of the princess tower very easily! That's why we have it here.
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7). Cannon Cart :

"Hey, don't call me useless Sparky's Brother!"
Cannon Cart is another powerful card with lots of roles. It can work as a 
  • Win Condition
  • Powerful Defense
  • Tank Killer
If a cannon cart locks to the princess tower it deals great damage even after it gets destroyed & becomes a standing cannon. That's why we have it in this deck because of his Power!
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8). Magic Archer :

"I am a 'Male' Magical Archer"
Finally the Magic Archer with lot of Magical Powers. Magic Archer can be a bit annoying for your opponent because of the Archery he does. Magic Archer can take out swarms, also can work as a Win Condition & that's why we have it here. There's no reason not to use it, if you think so you can go with Valkyrie, but I know one thing you will replace Valkyrie with Magic Archer for sure.
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Conclusion :

Anyways thanks for reading this posts. Hope it works for you all & I don't guarantee to you 100% Win-rate because all decks don't have Win-rate more than 60% Right? And if you have low level cards from these deck & you are at big league checkout rest of our decks in which your some cards are upgraded more!
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Cheers.