I don’t know if this is the correct place to discuss this, but right now the location for passing a minion to your Duos partner is buggy. It’s always pretty hard to distinguish if your minion is going to get passed correctly, but it has been noticeably worse as of the most recent patch. I think moving that pass area slightly lower (outside of the board/deck space) would go a long way with not accidentally playing a minion you want to pass.
Jinmarkus,
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