Well...for starters:
-Mash Kyrielight is Banned, seeing as she isn't a true Heroic Spirit and doesn't exist in this rp's universe.
-Swimsuit Servants and Holiday Servants are banned for obvious reasons.
get your waifu fix in other ways-If an instance of a servant already exists in the rp, barring some exceptions, all other iterations of them are banned. EX: If Arthur Saber exists, then a Class Card for Arthur Lancer cannot exist in the rp. The exception to this are the Hassans.
-No Lily Servants, or younger versions such as Alexander, rather than Iskandar.
-Only the aforementioned eight classes of Saber, Lancer, Archer, Rider, Assassin, Caster, Berserker, and Shielder are able to become usable class cards to the characters of the rp, barring future exceptions.
-Demon Servants aren't able to become Class Cards, as they're a bit too nasty for the Throne to think would be a good idea to shove into someone's soul.
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Memes-I will allow servants after the year 1900 on a case by case basis, as Audey Murphy is a fucking legend and I'd be sad if he was banned. I ain't making myself sad.
-Any of the versions of Nameless Archer
-Zhuge Liang (Waver), but if you want to make Zhuge Liang something else, go right ahead
-Any of the "Mysterious Heroine X" variants
-Joke servants such as Jaguar Man
-Servants that are just characters from other Type-Moon works EX: Ryougi Shiki
-Quetzacoatl
-Ishtar
-Gilles De Rais
-Merlin
-Nursery Rhyme
Banned for First Class Cards:
-Any Incarnation of Vishnu
-Vlad III/Dracula/The Impaler
-Gilgamesh(Do you really wanna be called a mongrel day 1 of the rp?)
-Hercules/Heracles
-King Hassan
-Achilles
-Scathach
-Atilla
-Stheno
-Ozymandias
-Enkidu
As for what IS allowed...pretty much anything else you could think of. If you wanna make an iteration of an existing servant in a class they've never been that makes sense, or wanna make a servant for a character from history/legend that you think is super dope and doesn't already exist, then go ahead! I want people to play what they want, unless what you want is random bikini clad genderbent historical figures.
Also, do keep in mind that starting off, servants are going to be a bit weaker than they would be normally when in a vessel of their own. Even so, I've placed some of the more "Overpowered" servants that are still somewhat able to be fought to be obtainable later, just not at the start.
In terms of how exactly you guys will obtain more cards, well, that's more or less gonna be based on whether people suggest them to me or not. I'm mostly going to try and throw a mixed, balanced bag of servants out when its time for someone to get a new card, but if someone requests a specific servant, I'll see what I can do to weave them into the narrative somehow.