Any good easy to make decks?

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If you have a wrecker panda (SR card from Valkyrie's rage box, only need 1) it's quite easy to make a farm deck, works on most of the level 40 duelists. Not a 100% guaranteed win but very good chances and pulls off 6k-7k scores easily.

Basically, use draw sense: earth (if you haven't gotten that, it's a random drop, use Weevil's draw sense: low level instead, which you can get by leveling him up). This allows you to draw wrecker panda. The rest of the deck should just be all the highest level monsters you have (such as blue eyes white dragon) and a few life point cards, plus some stop defense cards. Basically, once you summon wrecker panda you can keep increasing its attack by using your lifepoints, and healing yourself with the lp cards, and once you have it above 10k attack, play a stop defense on a monster with low attack, then attack it to do over 10k damage to opponents lifepoints, and you win with a massive score.

Check out the wrecker panda page on this wiki if you don't know what the effect does.

Use yami yugi's yami, or kaiba's performance peak. Other monsters and staples are your choice. Ld 40 eziest are rex weevil mako téa. Focus till get skill you want, then move to farm odion 40. Get scorpion (and insect imitation if u can), then even street duelist lv 38 you will own it.

To be honest, to beat some of the LD is not that hard. What you need is monster with 1700 attack and attack boost card (equip card/spell) My suggestion is for you to duel rex first and got 3 copies of his dino monster (crawling dragon/urabi/king rex) Then level up Rex and use that dinos with dinosaur kingdom skill to deal with other LD . Start collecting keys, gems and gold and build farm deck. For me, cerberus farm deck is enough for now (can be used against mai, yugi, tea, odion, mako, weevil, rex)

Level up stage and characters. Get gems and UR and SR atones. Open packs wisely. Use paradox skill or build cerberus, piranha army and unhappy girl farming decks. There's no faster way and you can't play efficiently if you don't have at least one of those. You could try to speed it up by convert some URs or SRs from LDs decks when you unlock them.

Then I suggest you build a farming deck first. It's just wasting keys if you don't get at least 5~6 boxes while dueling with LDs

The "easiest" would probably be either Yugi's Power of the dark style deck or Kaiba's Peak performance. And run mostly 3 and 4 star high attack monsters with a couple strong tribute summons and easy to use spell and trap cards especially if you are using Auto.