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In multiplayer, if the client plays Thalia's Lieutenant (new SOI card, so forum software doesn't know it yet) while they control Champion of the Parish, both players have "Waiting for opponent..." forever.

This also happened with Thalia's Lieutenant entering the battlefield when Silverblade Paladin was already on the battlefield. Once again, this was on the client's battlefield, not the host's.

I suspect that it will happen with any two creatures which trigger abilities upon entering the battlefield. It ruins the whole game and makes Forge multiplayer impossible to play unless with specific bug-workaround decks. It's a critical issue, IMO.