hey guys i summon obelisk the tormentour in a duel and my opponent have 4 facedown includ mirror force i know he have a trap to reflect my attack and destroy monsters but i said my blue eyes will destroyed but my obelisk is uneffected by traps and so my partner did and i attack but my opponent activate mirror force and my obelisk and my blue eyes was gone

Moved to cards and decks discussion

Obelisk can't be targeted, that's all... so mirror > Obelisk

Try to summon tributing Harneded Armed Dragon.
The TCG is not like the anime.