Jar of Greed is used to thin your deck faster than Yugi Muto to achieve "Cards on the Brink".
If you have a chance to decrease your LP to 100 to achieve "LP on the Brink", do that. You can decrease your LP by using Abyssal Designer and attacking Yugi Muto's Def position monster buffed up with Castle Walls.
Piranha deck (5,000 - 6,000)
If you have not obtained Rex's Titan Showdown Skill, the most useful skill to farm Yugi Muto Lvl 40, this Piranha deck will be the best to beat Yugi Muto Lvl 30. If the ATK of your Millennium Scorpion reaches to 5,000, Piranha Army can inflict "Over 9,999 Damage" using 2 copies of Riryoku and an equip spell that gives 500 ATK at least.
Rex's Piranha deck
If you want other LDs to acquire drop skill, simply replace Dino monsters with other 1700 or above ATK monsters.
If you have already acquired Titan Showdown skill or don't want to use Rex for some reasons, Leotaur and any other high stats level 4 monsters are fine. If you don't use Millennium Scorpion and Insect Imitation, high ATK level 3 monsters work as well.
Dinosaur deck (5,000 - 6,000)
Using the "Dinosaur Kingdom" skill and the standard dino monsters beatdown, this can handle most of Yugi's monsters as well as preparing a counter for his Gandora by using Abyssal.
Used this one to get usually 3k. Just stale game and then ritual summon a Zeralue eyes white dragon (if you staled game with enough monsters 'cause of "a feint plan"). You'll get 3k by using banner of command aking no damage.
Basically, any ritual with a bunch of drawhigh attack monsters will do.