Can you stack the same card on the same character? My cleric cast two copies of Righteous Frenzy on my Warrior in a row, and in the end only one remained: just one graphic, just one Frenzy bonus.
Nope, no stacking of identical cards. You can stack up to three attachments of different cards though, so Righteous Frenzy and Unholy Frenzy for example will boost melee damage by 2+2=4.
Yes, I've done that a couple times. Pity about the lack of being purely Righteous in one's Frenzy, though.
I'm pretty sure the answer is spelled out right in front of me here, but just to check, you cannot stack Healing Presence on the same character right? To increase the utility of this card, I really wish you could "target self". It makes sense for the cleric to be a "healing presence", and I often find that my cleric is the one who is least in need of healing, so turning my cleric into something that heals all adjacent allies would be great. I guess it's a low level spell so that's why it's limited in this way, but still, one can wish...
Correct, as I learned the hard way: you cannot stack copies of a single named card. You can CAST them, which matters for things like Burning Fingers ('cause it will do the initial damage every time), but only one will remain ATTACHED. And, yes, people have wondered about Healing Presence. It just seems that the devs want it to be limited like this. It's more helpful for certain party builds, e.g., one with two Priests in it.