So since this Stannis stops all card draw through card effects would he stop the extra draw from the agenda?

widowmaker93 said:

Good question. I tend to lean towards yes, because his text does say "cannot draw cards through card effects…" and what is the agenda's extra draw, but a passive card effect .

It's a yes, no question. The agenda is a card, so its effect is a card effect. Stannis already stops Kings of Summer and Knights of the Realm (and Power Behind the Throne).