So what are the odds of rare cards? 1 in 100? Or is it unknown? What about the ritual or the dark tower? Are they just side quests and when you get to the boss it's the same thing or what? By the sounds of it adventure mode is the way to go.

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RAINBOW

The odds of rare cards are based on the level of the enemy.

The "value of X" bosses are level 9, so they have good odds.
The Dark Rituals boss is level 10, so it has even better odds, but if you are unlucky, you'll get the guardian of moun a little too often.
Arena boss (Amnezy) is level 10 or 11, I think.

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I am farming her about two months, killed like 100 times, never met any guild specific card at all.

I had once a mercenary card from her. So i guess it is possible to get this guild, but it was only once.

she is 7 level as a card, but I think we should look at quest level, and she is one of the highest level in this case (22 or something near it, will edit later - when will have enough energy).

Zurga have a post with big statistics, and it seems that a chance to get rare card is near 8% and it seems that neither boss level nor quest level anyhow change the chances. I am playing adventure mode a lot, and I didn't see any difference either. So i think chances are quite equil

Black tower bosses is quite good to farm, because you spend only 12 energy(and in case on nival and toxic - they give 2 cards most of the time), but if you have any guild specific deck, then imho it is better to farm either this guild specific boss or amnesy boss, otherwise you'll end with tons of garbage that you can't use anywhere (still on haloween event - i was having fun farming nival and toxic(last secret room from black tower - i can kill them in 7 to 9 turns, and that was a critical amount of turns to get all the masks for 1 game. Still got tons of crappy cards, nothing else - can't recommend to farm them.)

Here are my numbers about drop in adventure mode :
viewtopic.php?f=210&t=8005

I don't have actualized the numbers after I reach the 8000 cards, but the numbers doesn't change really.
(You can read in French here : viewtopic.php?f=33&t=5006&start=10#p96930 )
Promise, I will update French and English for the 9000 cards.

Actually, I farm the Scorpion in the dark tower.
He doesn't have any specific drop, so you don't get it too often like Maun on Inferno.
He gives at leat one rare (favor included) each day, doesn't have any guild limitation.
With him, I raise my playable rare drop rate from 2.31% to 3%

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Collectionneur de cartes