Strike: Deal 1 damage to each leader.
At the start of your end phase, if Sanguine is active for you, draw a card, then discard a card.
QIf Sanguine is not active for me, do I still discard a card with this follower's ability?
ANo. The condition, "if Sanguine is active for you," applies to the entire sentence, so the ability cannot be played.
QDoes this follower's Strike ability also deal 1 damage to my own leader?
AYes. It deals damage to all leaders.