Why the client passing nil to the server (Remote Event) ?

When printing the copyCard in the Local Script there are an output (Feral Imp) but when the copy card is passed to the server its become nil why ? and how to fix ?

local script

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local transfateToDeckEvent = ReplicatedStorage:WaitForChild("TransfateToDeckEvent")
card = script.Parent.Parent

local copyCard = card:Clone()
print("client output : ",copyCard)
transfateToDeckEvent:FireServer(copyCard)

script

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local transfateToDeckEvent = Instance.new("RemoteEvent", ReplicatedStorage)
transfateToDeckEvent.Name = "TransfateToDeckEvent"

local function transfareToDeck(player, Args)
    print("server output : ",copyCard)
end

transfateToDeckEvent.OnServerEvent:Connect(transfareToDeck)

This is the output:

client output : Feral Imp server output : nil