By direct admission of the Arena team (through patchnotes) the matchmaking takes into account both your rank and the "power level" of the deck, yet, they didn't expand on what they mean by that.
It is possible that it has something to do with the rarity count as well as the win-rate or win-history of specific decks.
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It is possible that it has something to do with the rarity count as well as the win-rate or win-history of specific decks.