Requires no skill so can be used with any character.
Really easy to understand and use by the auto-duel A.I. because the only strategy involved is excavating a lot.
The best opening play is placing Komushroom face-down.
Revive World Carrotweight Champion by discarding Amarylease.
When Amarylease is in the graveyard, use its effect to summon Guardioak, Lotuswain, or Hermitree for 1 less tribute.
Always use Guardioak, Lotuswain, and Hermitree's effect.
Excavate Marshalleaf to destroy your opponent's monsters, and Komushroom for his spell/trap cards.
Add Bladefender to your hand when he is excavated. You can then summon him to use as a beater and excavate a card when he destroys an opponent's monster.
If you really need to excavate, you can normal summon Marshalleaf and use his effect. Then send him to the graveyard to revive Carrotweight.
Wall of Disruption and Mirror Wall are easy-to-use, splashable disruption, that also prevents the A.I. from decking out too quickly.
You can use WATER monsters to make a beatdown deck by swarming the field and simply relying on their high attack. It's relatively cheap to make since many of them are low rarity or from the card trader. Mako's skill - Mythic Depths is recommended to used in this deck too.
Auto decks are decks that are mainly made to be used with the "Auto-Duel" function. The reason why people often want to go with Auto-Duel is simply because it is done much faster than manual play, since it is fast forwarded and easy to use with just one button. Keep in mind that win rates for auto decks vary depending on what level of Standard Duelists you are going against.
Oh yeah The AI Is odd though Sometimes It does one thing and then under the same circumstances will do something entirely different. I just use it for Stardard chumping, roaming legendaries, and occasionally vagabond. I observe it just in case it makes a mistake so I can fix it.
If Konami wants the player to play more instead of AI, they should make the game less grindy. That's what online duelling is for. Some of you suckers just like to be compliant with less quality of life stuff like some kind of Stockholm syndrome.