Hello there and sorry for this stupid question.

I cant undestand how work Sneaky Git ability.

"If revealed card is odd " - what that mean? Unique card? Or other not Sneaky Git? Or what?

Thank you for answer.

is refers to the cost of the card.

Yes, it's the same as Night Goblin Fanatic, and should say "If the printed cost of the revealed card is odd …".