In stats, anything above 50% winrate should get legend eventuelly. Playing the same deck would make you very good at the matchups but maybe a bit boring. However, if you learn to tech the deck depending on what matchups you face a lot it can be very rewarding.
Here is a link to a probability/stat calculator that shows on average games needed for a specific winrate to reach legend. Good luck mate.
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In stats, anything above 50% winrate should get legend eventuelly. Playing the same deck would make you very good at the matchups but maybe a bit boring. However, if you learn to tech the deck depending on what matchups you face a lot it can be very rewarding.
Here is a link to a probability/stat calculator that shows on average games needed for a specific winrate to reach legend. Good luck mate.
https://www.primedope.com/number-of-games-to-reach-legend-in-hearthstone/