Edit - Pending further investigation, will note specific case(s) where wasn't electrical or arcane [Feel free to delete if you'd rather have a specific detailed bug first] Spells unrelated/unaffected by this card may suggest they are, as card is highlighted prior. Not sure if the weaker one or other such boosters are also doing this yet, but at least this one is. Thanks much (and great game), CKaz
You could take a screenshot the next time you see this. Spark generator also makes arcane attacks harder to block which doesn't mean anything if your opponent doesn't have any blocks requiring a die roll.
