Interaction between Stealer of Souls and Southsea Scoundrel

Hello,

I just played a Southsea Scoundrel on a board with Stealer of Souls in the arena. As the Stealer changes the manacost of drawn cards into health-costs and the cardtext of the Scoundrel specifically says “they DRAW theirs aswell”, the discovered card should therefore cost health instead of mana. That was however not the case.

Stealer of Souls specifically states that cards drawn by you cost health instead of mana.

Southsea Scoundrel specifically states that “they [the opponent] draws theirs as well”