Using the clown monsters and rabbits, their effects will allow you to either destroy their monsters or return them to their hand. This works quite well against Pegasus since Toon monsters can't attack the turn they are summoned.
Since the aim of this deck is to get a high score, you will perform a fusion summon, Ritual Summon and also use Summoner of Illusions to get Blue Eyes Ultimate to reach over 5,000 damage.
It's recommended to do this gradually as you progress in your turns since you will most likely not be able to do them all in the same turn. Start by summoning Dream Clown and/or Blade Rabbit and have them in a different position each turn while also turning them every turn manually if you don't have Labyrinth up. Slowly start to either fuse or ritual summon in a way where you still have monsters on your field that can take care of enemy's monster, but try to leave 1 monster slot open for the last turn so that you can set a Summoner of Illusions and then use Desert Sunlight.
Don't turn off the notification
If you happen to be using "Toggle Button" for the Activation Confirmation, make sure to not turn the notification to off after you set your traps like Curse of Anubis, Windstorm or Desert Sunlight. This is because Pegasus's Copycat and Big-Tusked Mammoth can attack the turn they are summoned. If you only have a copy of Blade Rabbit or any of the clown monsters and it gets destroyed, then it will be difficult to manage the earlier turns.
Obtaining a high score
There are a few things to keep in mind when trying to get a high score:
Perform ritual, special and fusion summon for the bonuses.
Try not to get hit for the no damage taken bonus which is 500.
If you get hit, that is still fine. Avoid inflicting battle damage to Pegasus's LP until you finish a duel, then you can get "Comeback Victory" assessment.
Other notable stuff
While skills aren't necessary, it can help you handle the earlier turns if you use skills like Bandit Keith's Switcheroo, Tea's Duel Stanby!, or Restart.
Blue Eyes Ultimate's purpose is to easily deal over 5,000 damage with 1 Riryoku, but you can use other high attack monsters and use 2 Riryoku if you don't have it.
You can put in a high level monster to get a tribute summon bonus.
This stupid deck has screwed me a number of times going against just level 30 Pegasus. On the last turn he uses his golden apple card to score a monster with the same attack/defense of my monster. And/or uses his trap magical arm, and when trying to flip summoner it causes my other cards to be in defense position which makes it so I can't attack any more and then I end up deck out defeat. I have yet to be able to summon any monsters from my fusion deck.
Man, I had a good run going with a Clown deck I scrounged up, then pissed away 160 star chips due to shitty luck (Stage 21, farming them isn't very efficient); one game, Pegasus opened with TGAF, and double Mermaid. How the hell am I supposed to deal with that!?
Should I be throwing in De-Spell and Twister to just flat out destroy Toon World early? Only one Sphere Kuriboh, didn't realize I'd need more Blade Rabbit so I only managed to snag one and haven't seen another in DAYS. Things fall apart so quickly if LoN gets hit by Wild Tornado, or Pegasus starts spamming Toon summons and I can't deal with them all. Haven't bought Neo-Impact for Desert Sunlight, at all, 0 packs bought. Been trying to empty UR then focus on AoD.
I'll be happy to simply unlock Toon BEWD; sitting at 889,400 right now.