"serverscript with a clan rolling system Uchiha75% Namikaze45% Senju10% then add clan buffs for each Namikaze 19 speed and 155 hp Uchiha 17 speed 125 hp and Senju 185 hp and 20 speed then connect it to a textbutton when pressed the clan will be rolled and displayed in text Clandisplay datastore"

Creating a server script for a clan rolling system with specific probabilities for each clan, and then assigning buffs based on the clan rolled can be a bit complex, but let's break it down step by step. We'll also include functionality to display the rolled clan in a GUI text label when a TextButton is pressed. This script assumes you have basic understanding of Roblox Studio, DataStore for saving player data, and GUI elements.

```lua
-- Server Script
local DataStoreService = game:GetService("DataStoreService")
local clanDataStore = DataStoreService:GetDataStore("ClanDataStore")
local Players = game:GetService("Players")
local ReplicatedStorage = game:GetService("ReplicatedStorage")

-- Assuming there's a RemoteEvent named "ClanRollEvent" for communication
local ClanRollEvent = ReplicatedStorage:WaitForChild("ClanRollEvent")

local function rollClan()
    local randomNumber = math.random(1, 100)
    if randomNumber <= 75 then
        return "Uchiha"
    elseif randomNumber <= 75 + 45 then
        return "Namikaze"
    else
        return "Senju"
    end
end

local function applyClanBuffs(player, clan)
    -- You can adjust these buffs as needed
    local buffs = {
        Uchiha = {speed = 17, hp = 125},
        Namikaze = {speed = 19, hp = 155},
        Senju = {speed = 20, hp = 185},
    }

local buff = buffs[clan]

-- Apply buffs here
    -- For example, you could modify the player's humanoid properties or use attributes
    -- This is a basic placeholder for where you would apply the buffs
    local character = player.Character or player.CharacterAdded:Wait()
    local humanoid = character:WaitForChild("Humanoid")

humanoid.WalkSpeed += buff.speed
    humanoid.MaxHealth += buff.hp
    humanoid.Health = humanoid.MaxHealth
end

local function onClanRollRequested(player)
    local clan = rollClan()
    applyClanBuffs(player, clan)

-- Save clan to DataStore
    local success, errorMessage = pcall(function()
        clanDataStore:SetAsync(player.UserId, clan)
    end)

if not success then
        warn("Failed to save clan data for " .. player.Name .. ": " .. errorMessage)
    end

-- Fire the event back to the client to update the UI
    ClanRollEvent:FireClient(player, clan)
end

ClanRollEvent.OnServerEvent:Connect(onClanRollRequested)

Players.PlayerAdded:Connect(function(player)
    -- Load clan data when player joins
    local clan, error = pcall(function()
        return clanDataStore:GetAsync(player.UserId)
    end)

if clan then
        applyClanBuffs(player, clan)
    else
        warn(error)
    end
end)
```

For the client-side script to handle the button press and display the clan, you'll need a LocalScript under the TextButton:

```lua
-- LocalScript under the TextButton
local textButton = script.Parent
local player = game.Players.LocalPlayer
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local ClanRollEvent = ReplicatedStorage:WaitForChild("ClanRollEvent")

textButton.MouseButton1Click:Connect(function()
    ClanRollEvent:FireServer() -- Request a clan roll
end)

ClanRollEvent.OnClientEvent:Connect(function(clan)
    -- Assuming there's a TextLabel named "ClanDisplay" under a ScreenGui
    local clanDisplay = player.PlayerGui:FindFirstChild("ScreenGui", true):FindFirstChild("ClanDisplay", true)
    if clanDisplay then
        clanDisplay.Text = "Clan: " .. clan
    end
end)
```

This example covers the basic functionality of rolling a clan, applying buffs, saving the clan to a DataStore, and updating the client's UI to reflect the rolled clan. Remember, you'll need to adjust the script according to your game's specific needs, such as the exact way buffs are applied or how you're structuring your GUI.