MArcomage

I received a card not from my deck. I played the conjurer and the card taking his place was a forest dragen, which is not in my deck.

Most probably, you triggered the Nature keyword. What card did you play before Conjurer?

Conjurer has Nature keyword. Maybe you played another uncommon nature card before it.

Screenshots please, or/and game replay number/link once the game is finished.

I don´t know which card I played before the conjurere, sorry (game´s still going). Chances are that it was triggered by the Ent. Not sure.
Anyways, I didn´t know about the Nature sideeffect (don´t have a nature deck and very few nature cards in my Alliance deck) so it´s probably not a bug but me not knowing nature effect. Sorry.