Reshuffling is often credited with ending a favorable streak of cards.
Blackjack dealers decide when to reshuffle the cards or break a new deck, which does have an effect on a game. Dealers have control of the game, and must not only shuffle and deal the cards, but also take losing bets, pay winning hands, change cash into house chips (the round disks that casinos prefer players to bet with instead of cash), “change color” (changing the chips into larger or smaller denominations) and often help players by giving tips or answering questions.
