Note: Do keep in mind that this deck may not work 100% of the time as Keith's coin toss monsters can destroy your key cards depending on his luck. So try to take extra precaution.
Stalling until you draw your last card from your deck
It is important to do so in order to achieve the "Cards on the brink" assessment. You can stall by using The Hunter with 7 Weapons, Windstorm of Etaqua and Mirror Wall. The ATK of The Hunter with 7 Weapons can be usually considered as 2000 points as you gain another 1000 ATK when it battles against a selected monster type, which in this case is machine-type. If Keith summons monsters with 2000 ATK or more, you may use Acid Rain or Magnetic Mosquito to destroy them immediately. If he is swarming you with multiple level-4 monsters, you can set a 4-Starred Ladybug of Doom to wipe them off the field. Do destroy his monsters in the process of stalling so that he will not have anymore monsters to summon left. This is also to ensure that he does not tribute summon a stronger version of Twin-Barrel Dragon.
During your final turn before decking out
Before you execute the following combo, make sure that you have The Hunter with 7 Weapons on the field and Spell Reclamation set 1 turn earlier. Also make sure that Keith controls no monster on the field so that you will be able land a direct attack on him. The combo is as follows: