For many playtest cards, you’ll need to make a generous assumption that basic game rules would be updated to allow them to work. The Mystery Booster 2 Playtest Card Notes section (reproduced here in individual Gatherer rulings) provides guidance for fitting these cards into the existing rules structure.
Snap Judgment
In a case where the match would already be decided by the outcome of the current game, Snap Judgment’s effect won’t do anything.
In a two-player game, the game ends immediately if one player concedes. If Snap Judgment hasn’t yet resolved when this happens, its effect won’t apply.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Will Liu
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