Poision Knife or +3 Axe

[iregev]

thanx,
that was what I thought, what seems odd is that knife is extremly powerfull for an item that costs 11K.
I Think almost all units level 1-3 deal less than 10 damage per AVG.
This Item upgrades the skeltoon archers by 28%

Also,
should I swap it to the axe when fighting units with poison ressitance like plants ?