Leadership is bugged. The Free Draw doesn't work if you don't have any draws left. That is; normally you would discard and then draw up to 2 cards, and your draw limit doesn't change. But if you got 0 draw limit left, you can't draw new cards after discarding.
Known feature / bug, that hasn't been fixed yet: http://forums.cardhunter.com/threads/leadership-draws-0-cards-if-you-are-already-at-draw-limit.7974/ http://forums.cardhunter.com/threads/free-draw-doesnt-draw-cards-if-draw-limit-is-reached.7596/ http://forums.cardhunter.com/thread...-dont-draw-after-hitting-the-draw-limit.6571/
