One membership. It moves you up the dispute queue and speeds up your grind — it never buys an advantage inside a match.
Pulze takes no cut of any match — the whole pot goes to the winner whether you pay for membership or not. Nothing on the free tier is time-limited or throttled.
Overdrive changes queue position and grind speed, nothing else. It cannot affect match results, opponent quality, ladder points, or how a dispute is decided — a moderator reading your screenshots does not see whether you pay.