XMage has a JSON output format, but last I looked it was difficult to parse. The potential effects for Magic are so vast it's extremely difficult to find a sane

XMage has a JSON output format, but last I looked it was difficult to parse. The potential effects for Magic are so vast it's extremely difficult to find a sane structured format to record things in, so the JSON format is mostly a couple of identifying fields and a string describing what happened (ie. Source was this permanent, target was this player, what happened is a giant string field).