looking at how necromancer cards (+1 int +1% mdef bypass) goes for 1m, i'd say a centipede should only be worth half that (if worth it at all)... necromancer cards are readily available and CMIIW i'm quite sure 1% mdef bypass is better than a straight +3 MATK...
This card is built to totally be put in Elemental Sword!
AD Crea with this gets more Int than a Bazer can give.
Also its okay with Ele Sword users like Stalker! :o