Adding a deck size limit for Quick Match is something we have been considering for a very long time, for various reasons, but mostly performance of the app: our game supports a huge range of devices now, and some really struggle when very large decks are played.
Any decision on a limit is going to end up being arbitrary, so we have arbitrarily chosen 120 cards for this maximum, as three times our minimum. This gives all players clear indication of how long a game might go on and where they need to aim for if they have a late-game or mill win-condition.
This change is now live. If you attempt to bring more than 119 plus hero to Rated quick match, you will get an error and need to trim your deck to continue.
Please note that Unrated games have no maximum deck size, which we feel is a fair compromise for those who really want to go really really big, since you can rage-quit without penalty in unrated if you really don't fancy that match-up.
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