In hand: Preparation of Rites
In grave: Advanced Ritual Art
In deck: Garlandolf, King of Destruction, Dark Magician
Activate Preparation of Rites, get Garlandolf, King of Destruction from your deck to your hand and Advanced Ritual Art from your graveyard to your hand.
Activate Advanced Ritual Art, sending Dark Magician from your deck to your graveyard to ritual summon Garlandolf, King of Destruction from your hand.
Garlandolf's effect activates, it destroys all 5 monsters your opponent controls as they all have less than 2500 DEF, which is Garlandolf's attack, because your opponent is stupid and did not chain his Forbidden Lance targetting Garlandolf to save half his monsters.
Then Garlandolf's attack goes to 3000 because it destroyed 5 monsters and gained 100 ATK for each, so even if Forbidden Lance is now used to reduce his attack when it attacks directly, it does 2200 damage.
And ofc this is not a solution. Just throwing it in there because I saw the hole halfway through writing it and didn't want to delete the post.
Btw, if anyone is thinking Dark Worlds, that's not a solution either. Null and Void does not discard from the hand.
P.S. : If chances are irrelevant, activate Cup of Ace (will not be stopped by Null and Void because it involves a coin toss, apparently), draw into Sirocco and Kalut, and you know the rest. But that's probably just abusing the fact that the poster forgot to say "You lose all your coin tosses".