What you want to do is use a rather larger deck (about 60 cards) and center it around stalling, putting in cards such as "Swords of Revealing Light", "Nightmare Steel Cage", "Spellbinding Circle", "Shadow Spell", "Gravity Bind", etc...
Basically, you want to prevent your opponent from attacking you until he runs out of cards. At least that's what my spell/trap-card is all about.
You guys are new at this game aren't you ? In the game its even possible to build an all spell deck that can beat every player with perfect ease. Its a clockwork control variation (read up on your TCG history if you don't know what that is). Ideally you'd run it with some traps (3xsolemn, 3x Skill Drain, 3x Jar of Greed) and some monsters (outstanding dog Marron, Morphing jar, nimble momonga), to get my duel ranking up past 50%, I devised an all spell version. Its a dream of a deck since it works well in single duelling and in tag duelling because it locks out your partner (keeping him from doing stupid stuff) every bit as much as your opponents.
3x Clock Tower Prison 3x Terraforming 3x Magic Reflector 3x Spell reproduction 3x Nightmare's Steel Cage 2x Level Limit Area B 1x Swords of Revealing light 1x Scapegoat 3x Wave-Motion Cannon 3x Upstart Goblin 2x Fissure 3x Smashing Ground 1x Pot of Greed 3x Toon Table of Contents 2x Shield Crush 3x Prohibition.
The plan is simple : get a clock tower prison and a stall card. Load the clock tower with magic reflectors (which you can re-use thanks to spell repro) and stall for 4 turns. After that, you can't take anymore battle damage. Now wait until you get a wave-motion cannon and it has enough counters on it to finish the opponent off. prohibition can stave off natural enemies like horus and burn cards. Pot and TToC are thinners.
If you play this deck for other purposes than just having an all spell deck, then change : -1 prohibition -1 Upstart Goblin -2 Shield Crush -2 Fissure -3 Toon Table -3 Smashing Ground
+1 outstanding Dog marron +3 Skill Drain +3 Solemn Judgment +1 Morphing Jar +2 Jar of Greed +3 Nimble Momonga
Apart from fifth gadget (which is plain unbeatable barring god hands), that's the best deck I've played in this game.
@Rex : No, I meant shield Crush. I'm aware the game calls it shield crash, because its a translation konami made, given this game is older than the TCG release of Shield Crush. But the actual card in the TCG is called Shield Crush.
Trap monsters aren't extremely good. Barring metal reflect slime to stall and then metamorphing it to cyber end, they are extremely vulnerable, because they are succeptible to monster destruction as well as spell and trap destruction.