In this article, I analyse a macro-archetype that players tend to love or hate: Lock, also known as Prison. If you could lock your opponent out of the tennis court, then you could win at leisure (provided the umpire was on board!). You can sort of do this in Magic, locking your opponent out of the game. Your opponent is at the table, but not meaningfully participating. Given this unconventional aim, Lock decks tend to require off-beat deck building and earn the ire of opponents. Reading this article will give you insights into how to approach building and beating Lock decks. First, I identify the key features of Lock according to Patrick Chapin, then I examine two Lock decks that have succeeded in 7 Point Highlander.