since you wrote the topic in english i may help you, may i have the item bonus script?
all i can think is to reduce your defense, but not only that, also try to add a percentage of resistance to physical/ranged attacks which relly on thanatos card
for example, if your opponen is a sniper and it has a thanatos card, you can switch into a card that reduces your defense and raises the tolerance agains ranged attack and also increasing the hp would be pretty cool too
try this agains a sniper which has thanatos card in a custom card (or just take a X card to test then you return that X card as normal as it was)
bonus bLongAtkDef,15; bonus bDefRate,-20; bonus bDef2Rate,-20; bonus bMaxHPrate,15;
the trick are weapons like spike, grimtooth and so on, anti-thana card
give a try there
tao gunka is too risky, your def & mdef is lowered a lot, i don't recomend it at all, unless you have dcent damag reduction or resistances
try it (: