I vs the same people at least twice in a row every tourney. When only you or your opponent are searching for a match, then the matchmaking systems pairs you up. It doesn't take into account whether or not you've already played them in the tourney, AFAIK.
DT is not rigged, if i understand correctly starting a match with a player who has a similar deck at a similar time can cause you to vs that player, meaning double/triple/ect matches can happen easily, however as i also understand it exploiting this with your friends is unacceptable so do not take this information lightly
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