No certain skill is required, and you can use any character with this deck to farm Keith and to aim to acquire drop skills. → Best ways to get drop skills
A bit pricey. So many SR cards from booster packs.
Not guarantee 100 percent victory and still dependent on Keith's luck.
How to use this deck
Dealing with the machines
Leotaur, The Hunter with 7 Weapons and Jerry Beans Man can already handle most of Bandit Keith's monsters, unless he uses some equip spells or get the coin toss right, but in general, your monsters can easily handle them. Use the traps in the deck for some protection if he starts to equip or destroy your monsters.
Keep summoning more monsters to deal with anything that he summons to not let him tribute summon into Barrel Dragon and it will be easy.
Obtaining a high score
To get a high score with this deck, destroy 10 monsters, tribute summon, ritual summon, deal more than 5,000 damage, activate both spell(s) and trap(s), and win with 0 cards left in your deck
It's recommended to not try to get low LP, unless you have multiple monsters on the field, since Bandit Keith can get lucky with his coin toss and destroy your monster and go for a direct attack.
Using and buffing Cu Chulainn on the last turn
If you have at least 2 monsters on the field, tribute summon Blue Eyes White Dragon and ritual summon Cu Chulainn by using the Blue Eyes as the sacrifice. Increase Cu Chulainn's attack using his effect, Riryoku and Ritual Weapon so that he has more than 5,000 attack. If Bandit Keith has monster(s) on the field, use Acid Rain or your other monster to destroy it so Cú Chulainn the Awakened can deal direct damage.