With the bartender of dalaran, I had a Primalfin Totem (0/3), I gave it +2/+2 then I used on it the card that add 3 copies in my run deck. In the animation, I clearly could see it added 3 2/5 totems. I then used the 0 cost card that replace the 8 minions with other ones, which shown a 0/3 version of this. The result is that my deck shows that I have 3 totems 0/3, 1 2/5 and 1 separate totem which also has 0/3. The fact that I have only 1 2/5 instead of 4 might just be a visual bug in the bar but this would be very counter intuitive. The fact that I have a separate 0/3 totem might be because I replaced all minions as last action (I did it in case I would want to remove a minion with another 0 cost card).
Sorry if this has been reported already, people being agressive here I don’t wanna risk reading annoying things.
By the way, as usual the AI could really be improved (I don’t like “advance wars-like” AI, that is, an AI that is that weak that it receives a lot more stuff that you have to overcome just by exploiting AI issues): Mo Eniwhiskers just obtained 2 coins by attacking with the chest which destroyed it (mana anomaly gave it 1/1), he had 0 mana left and probably had nothing in his hand that costed 2 mana or less and thus he didn’t use any coin to draw cards despite by not trying he was facing an obvious lethal.