Magic The Gathering: Arena Dev Tracker

Consider that Lurrus is the first card on MTG:Arena that both allows you cast a spell constrained by its CMC and doesn't provide an alternative cost for doing so (unlike cards like [[Electodominance]]). So right off the bat we're talking about something new, but that looked really familiar - I'm not surprised that our testing strategy missed this case.

In order to even begin proposing casting the spell, some rule or ability needs to grant you permission to do so. Lurrus' code sees a card in your graveyard with CMC <= 2, and so it proposes it, thus you can start casting it. We need an entirely different step in the process, and thus entirely different code, to then step in at the choose-X step to enforce that the resulting CMC is STILL <=2. That doesn't come "free" from just "implement the comprehensive rules 1:1" - Lurrus' "you have permission to cast a CMC <= 2 spell" code needs to check in again there. Fortunately, the fix makes it so all CMC-capped casting permissions w...

Nailed it. Release bugs are the worst from the stress perspective - we have such limited time to fix in time for adequate testing before the "fast follow" release! The puzzle-solving aspect is one of my favorite components of this job. #wotc_staff

Thank you! Fixing these things is fun (of course, not as fun as getting them right in the first place!). #wotc_staff

We have a fix for this coming this week. #wotc_staff

We're aware of this issue, and we hope to have a fix for it this week! We're sorry for the inconvenience.

Cards you see in your opponent's hand aren't "real" cards - internally, we call the object a RevealedCard. They get created when a known card goes to a hidden zone, and are removed when a card with the same appearance leaves (or the contents of that zone become unknown in some other way, like a Brainstorm effect). RevealedCards should have no impact on actual gameplay, such as effects that count the number of cards in a hand, or selecting a card to discard.

We didn't properly handle making RevealedCards for tokens that have been mutated; they make RevealedCards because the object-on-the-battlefield was a "real card". Clearly, that should be examined on a component-by-component basis. We should fix it this week, I hope, but know that it's only a visual problem. #wotc_staff

Thanks for the report. I have some ideas about what's happening here, I'll look into then soon. #wotc_staff