Spellcasters deck.

Fix/ Rate
i wanna make the deck a 40 card deck, but idk what to cut and what to put in,

MONSTERS: 20
3 Chaos Sorcerer
3 Kycoo
3 Breaker the magical warrior
2 Night' End Sorcerer
2 apprentice magicians
1 old vindictive magician
2 Defender the magical knight
1 Oracle of the Sun
1 Magician's Valkyria
1 Effect Vieler
1 honest

Spells: 13
3 Secret Village
2 MST
1 Dark Hole
1 heavy storm
2 Solidarity
1 Monster Reborn
1 Book of Moon
2 Smashing Ground

Traps: 12
2 Solemn Warnings
2 Torrential
2 Compulsory
3 Reckless greed
1 mirror force
1 Seven tools of a bandit
1 solemn judgement

That is easy.

Put both Solidarity cards out of your Deck, if you plan to Play Honest which is a Fairy type, it doesn't make sense.
Aditionally, only play secret village 2x because it can backfire if you dont control any Spellcaster, and face-down cards like Old V. Magician and Aprentice Magician wont work very good either with this.

Night's End Sorcerer seems to be a bad choice too, at least one copy should be enough.
The same goes for Reckless Greed, play Allure of Darkness instead and leave out Reckless Greed.

Hope there is something usefull for you.