Use the Spirit Ryu's to stall until you can summon Blue Eyes White Dragon, Ultimate Dragon or Cu Chulainn with 2 Ritual Weapon in hand. Summon them once you can, and keep clearing his monsters and stall until you are left with 0 cards in your deck. On the last turn, use a Riryoku once by decreasing BEUD and increase Cu Chulainn, use Cu's effect and put more Ritual Weapons. Use BEUD to attack the set monster to open up for a direct attack and use Cu for the finishing attack.
Note: If you want to use Secret Pass to the Treasures on Cu Chulainn then don't summon him early and put the ritual weapons, summon him on the last turn instead.
Use skill like Sorcery Conduit or Draw Sense: Low Level to help get Cerberus into your hand if you don't get them from starting hand by getting attacked. Summon Cerberus and start using spells to increase your attack. Don't attack until you are left with 0 cards in your deck and make sure to keep a copy of Stop Defense or Shooting Star Bow - Ceal. On the last turn, either use stop defense on an enemy and Riryoku or equip Cerberus with the Ceal bow if you have 11,000 attack to deal the finishing blow.
Can special summon level 4 Insect monsters from the graveyard.
How to defeat Weevil's deck
Use Wonder Balloons
Wonder Balloons can decrease the ATK of Weevil's monsters significantly since he does not use cards to destroy spell card. Additionally, it is important to make the ATK of those monsters weaken in order to beat them equipped with Laser Cannon Armor.
Have cards to beat Grasschopper
Since Grasschopper's ATK at 2350 is higher than that of Judge Man, you will use monster removal cards or attack boosts to defeat it.