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The Odysee Lands, eg Darkwater Catacombs, are tricky to use. It's hard to decribe. It's in the replay. In short it works, but it tells the game, that it will add 2 mana.

*** fixed elsewhere

Also it seems that sometimes flashback does not work.

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I believe the issue (and the devs can correct me if I'm wrong) is that since the land produces 2 mana then that is what the highlighting function thinks it provides and doesn't take cost into account.

Can this be fixed, or are we chalking it up to the engine?

Mana declaration isn't flexible enough to model these fully - we can say it produces either or , or that it produces , but not that it produces {-1} . Highlighting both Tidehollow Strix and Shadowmage Infiltrator be when you only control a Forest and Darkwater Catacombs is less disruptive than highlighting neither. It's not as hopeless as "spend this mana only to cast creatures" effects or "lands/creatures you control have '{T}: add mana'" effects, but will still need a rewrite of a dauntingly large part of the engine.