The text in the table should match the text on the card. The explanation such as the bribing formula should be in the notes.
Your tittle should be Bribe|Corruption.
I aggree with Jappert concerning the art. Euro is a nice and colourful currency but it's not the one used in the game.
Concerning the mechanic itself, as Jappert said it a difficult field that you try to labour. Stealing creature is a "big deal" mechanic. However, I think that your idea in nice. It's not an instant kill because only part of the creatures will change side. Linking the percentage to the cost of the creature might seem fair. Obviously the buffs are disregarded.
A Pharaoh for example cost 9
and would have then about 11% change to change side. The unupped card cost 4
. The cost looks fair to me but I'm not an expert.