Try looking through trap list and what I can came up with are:
1. Trap Jammer/7 tools
Very hard to find and one is even not available anymore (will be back in a few days though, albeit you'll have to spend tons of gem opening packs)
2. Overwhelm/Champion's Vigilance
Both need big toon on the field to work so this might not work for everybody's deck. Let alone the fact that Overwhelm are also not available anymore and need the toon to be tribute-summoned while CV is from farming Kaiba :(
Str8 Flush works great. Set it after his field is clogged to prevent from being Stamped. Ideally set it when you have 1 card left on your deck so you can activate it on the last turn.
3. Malfunction - This seems to be the poor man's trap counter but I'm *NOT* sure if it'll work, cos it says on this web's data the negated trap can be reactivate immediately after. That sounds ridiculous to me and I wonder if it's correct.
Still haven't dueled him, so I'm not sure if he will fill his back row or not and not confident to recommend that. But if that's the case then I'm relived myself too, because I also have none of those cards I mentioned and now eyeing the Malfunction myself, lol. Straight flush and Storm it is then.
He does fill his backrow. You just need to be patient. Even if he doesn't, he will eventually set Metalmorph and Kunai. So if he activates Stamping Destruction to destroy your Straight Flush, chain it and bye bye kunai.
Here is my deck. I use 3 trap jammers/ + 1 seven tools of bandit.. I always set one of them and before the last turn I make sure I set two. As well I set the wild tornado's when i draw them. In case he uses Stamping Destruction, then I can destroy a card for free :D Seems to work for level 30 and 40
If you activate "Kunai with Chain" during the Battle Step, then you can activate its effect which changes the Battle Position. You cannot activate this effect if you activate "Kunai with Chain" during the Damage Step.[2]
Twister can only destroy the "Kunai with Chain" but doesn't negate its effect that change an attacking monster's battle position. What do you mean it can 🔥 it theoretically?
AI getting smarter...? What the hell... He sometimes didn't fill up his trap/spell zone.... Straight flush become null... Then he either use kunai or spiritual wind to counter piranha boosted with 10k dmg.. yes I can counter kunai with trap jammer..
Spiritual wind in other hand.. if I lock a wind monster with unhappy... Well he send my piranha back HOME (._.)...