making a steal spell

making a steal spell

hi, i'm working on a corridor and i want to make a steal spell, i wanted to create a test-spell but foar a reason i don't know, it don't work, could you please help me understand why?
thanks
http://img169.exs.cx/img169/8778/init1fz.jpg


and

http://img169.exs.cx/img169/2531/derober9oa.jpg
i've used the ability manaburn to make the ability "derober" and when i used the ability on a player 2 controled unit, only the game text appear with a correct value.

i didn't need anymore your help, i succes without it.
it was just a bad function used.