When people go to tournaments or to their local card store to play some mtg more often than not you face an unknown opponent with an unknown deck. There is no "matchmaking" that MTG Arena uses. You play against whatever the other person has whether it be one sided or not.

Please for the love of all that is holy get rid of your matchmaking algorithm and replace it with something this simple:
Step 1: Click play
Step 2: the next person in line no matter what their deck is matched to you and you play.