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After testing a bit more, I think I know what happened the first time. I was trashing cards and not seeing any activation, because most turns I was trashing only one card per turn, they all ended up with my bot opponent (who wasn't trashing anything). By pure coincidence, the few times there was a card left over in the trash at the start of my turn, I had a Shaman in my hand, making me see a connection that wasn't there.

The ability In games using this, at the start of your turn, gain a card from the trash costing up to 6 only activates if Shaman is in your hand. As I read it, it should activate every turn, even when you don't have any Shamans in your deck.

Edit: I got a Shaman game again and it worked properly now. Don't know what was happening earlier. Maybe I just did something wrong.