[Laughing_Man]

Originally Posted by MrLeXxLjr

If I activate the effect of can my opponent use the effect of to get rid of a card before my effect? Or any other effect for that matter witch isn't a counter?

No. n1099 removing 2 cards is a cost. The cost must be paid immediately and you cannot chain an effect to paying a cost.

Originally Posted by MrLeXxLjr

Or say for instance can he activate this effect before me during my turn?

No. You would have priority until you took an action or passed priority.

Originally Posted by MrLeXxLjr

Does only work against mission cards of odd entrance cost or any mission cards period?

Mission cards with an odd entrance cost.