You can use anyone as a sub, as long as they haven't joined the tournament before it started, and they agree to being your sub. So yes, you can use Tass.
Editing one thing in my first post: The one team substitute has to be someone that isn't even part of this tournament as of the time it starts. So if Shash doesn't post in here and join a team by the time it starts, someone can go ask him to be a sub.
Don't start choosing subs until the tournament starts though.
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