AI3 gives rare weapons. If you farm ai3 with a mono-life for even an hour, you'll spin a couple I think.
Rare weapons are definitely less rare than shards; in bronze or silver only a handful of arena decks have any shard in them. Rare weapons, however, are somewhat common. Getting some weapons is no problem. If they're not to your liking, get used to them. Each rare weapon has serious potential, so perhaps try it out?
Also, stop complaining about getting too many shards. When it comes to grinding, shards are MUCH more useful than weapons. You just have to build the proper deck around them.
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