Dont listin to that 10 spell / 10 trap / 20 monsters thats wrong !
Decks may based on less monsters and more spell or more traps anyways
to make a good deck you need to put card that helpes your deck not like it >_>
And you have to test that deck with someone you know hes good enought and about 10 and more duels .. dont think its 1-3 duels for testing a deck you have to preper for different stategies
and now every good duelist must to perper for every startegy meaning everyone has to use Synchro monsters even tho he dont have any Tuner or his deck donest based on that cuz simply ex some card eff gives you your opponent monster (maybe its a tuner) , Brain control , Monster reborn , Creater Swap etc
And maximum nummber of your deck must be 41-42 or also 44 will work but of course better is 40 and remember this
NEVER GIVE UP!Being a slifer doesnt mean a bad duelist just need some support
and post your deck(s) in Deck Place so you can get some advices ..
Let your deck contain cards that help your deck as i said above not cards you like
lemme list some important cards for every deck (mostly ... )
Lightning Vortex +
Fissure -
Smashing Ground -
Monster Reborn -
Mystical Space Typhoon +
Heavy Strom +
Mirror Force +
Bottomless Trap Hole / Sakuretsu Armor / Dimensional Prison +
Solemn Judgment / Dark Bribe +
Marshmalon/Spirit reaper -
+ = Important
- = Not that much
i see lots of duelist use thier favortie cards but the important thing useing the cards that can support your deck . Lots of duelists uses cards like spell binding circle , seven tools of the bandit , magic jammer and alot of old crap cards that i cant remmeber at the momnet i mean why useing Seven tools if theres Dark Bribe ( 1 card wont make big problem) or Magic Jammer .. Anyways my advice is to ya to use cards that support your deck and not every deck is winning deck .
Good luck on everything and hope we'll see your deck(s) in the deck shop so i can help you