Currently we have "either/or" Class/Race/Guild requirements in cards.

If a card says Marauder - Warrior, it means the Marauder, Warrior and Marauder-Warriors can use it.

Would be nice to introduce multi-requirements to cards.
Cards that require Marauder+Warrior, or Human+Guemelite.

Imagine a Theurgy (always require Priest) that also requires Warrior.

How would that distinction be made?

In my opinion, it would have Icon distinction and text distinction.
"Or" Icon = Slash = /
"Or" Text = Separated by Slashes.
Examples:
Warrior / Marauder / Mage
Kotoba / Zil Warriors

"AND" Icon = Current = *
"AND" Text = Separated by pluses
Examples:
Warrior + Marauder + Mage
Kotoba + Zil Warriors

In terms of Icons, there could be two types of icons.
One would be the usual "asterisk"

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Suggestions: Rank, Elite and Ranked Elite Stats | AoE vs Greater Stats | Fairplay Sollution | Overcards

good idea

I think it would be better if they just made more non-guilded multiclass cards with effects specific to each class, or additional affects that only trigger when the character has both classes. Along the lines of , except non guilded and concerning class instead of caste, and/or along the lines of . They already make non-class restricted cards that have additional effects for certain classes, it wouldn't be too large of a step to take, my only thing is that I'd like to see more non-guilded cards, the latest releases have multiguilded cards, and seem to ignore mercs that aren't courtiers.
Remember, we want more cards that fit in multiple places, double class requirements would be limited to only a handful of characters per combination, and if the cards themselves have good effects, they'll only be abused in a handful of decks.

Eternal/ateb= any of the non guilded cards requiring dual classes.
Stoneeater=only mage/priest
Temmujin/Nadarya= Marauder+mage/Warrior+mage/Marauder+warrior
Witchblades= Only real marauder+mages
Sap hearts would get shafted as they don't have multiclass.(Except keep the totems)
Priest Kararine=only guilded marauder+priest
Shrikan, Ahzerd, Nebsen, whatever that bald runic guy's name is, and coranthia= Priest+Warrior
The mechanist craftsman, Coranthia and Council Nexiriam= warrior+craftsman
Coranthia= Priest+Craftsman
Most of the marauder + warrior cards are Zil and Nehants, and even then it's rare that their multiclass characters are even usable/plausible as most of them can only sit in the amnezy/level rooms, and even in that case, the decks usually have only 1 character with both classes (Torment in ecstacy demons, Abomination(lol) in Zil decks, the shadow in hand deny)
Putting more cards in ^ hands alone isn't a good idea imo(Witchblades and warrior TGs are the only plausible cases for any sort of usefulness/consistency in a deck if the cards need both classes to work) as they'd be extremely limited in overall usefulness, and power creep is no longer really a creep as it is a leap, so the last thing I'm looking forward to is every other update having a multiclass character to squeeze more use out of those multiclass only cards and let feerik start slipping more broken combos into their releases. More multiclass characters=more combos= more demand on cards=inflation of anything not in the newcomers booster. It's bad enough with that whole 1 million crystals thrown into the market every weekend.

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Fixing Eredan
Courtiers are not your friends