How do I make a player's health increase from default (100) to 300 when they join a team?

Hey, I'm making a game and there are three teams, Gods, Mortals, and Mortal Heroes. I want the Mortal Heroes and Mortals to still have the usual 100 health but I want the player on the Gods team to have 300 health ONCE HE JOINS THE TEAM. This is in caps because it can't make him reset, it has to give him the health without him resetting. The health needs to be given to him right when he switches onto the Gods team (which he does by stepping on a spawn point) without him having to reset or die in any way. This was my attempt at it, it is fairly simple but I can tell it didn't work, what should I change about it to make it work?

if player.TeamColor == "Lapis" then
player.Health = 300
end

Note: The team color for Gods is Lapis. The color for Mortals is New Yeller. And the color for Mortal Heroes is Really Red, just in case you need any of that information. Thanks, Skyraider5

Alright, here we are again.

The problem in your script is easy to understand, but it's very hard to solve, not even saying that it might be impossible

The problem is: Humanoids can't have an health that's bigger than 100... If..... MaxHealth remains on 100.

You also have to change the MaxHealth IntValue. You also forgot to write the .Character.Humanoid path. Here, try this.

game.Players.PlayerAdded:connect(function(player)
--Because the team could not change right in the Player Adding, let's add a loop!
    while wait() do
        if player.Team == game.Teams.Gods then --Yeah... TeamColor is screwed T_T
            player.Character.Humanoid.MaxHealth = 300
            player.Character.Humanoid.Health = 300
        end
    end
end)

If it works, please mark this answer as the Solution.

As always, good scripting! ;)