Author Fight Club
Hold an evidence-comparison duel: each partner defends one card on the same question, arguing recency, qualifications, methodology, and specificity.
Find two cards that answer the same question in opposite directions. Every topic has clashing evidence on its central statistic. Each partner takes one card.
Alternate 30-second speeches that make evidence-comparison arguments only: my author is more qualified because... my study is more recent... theirs is a think-tank projection and mine is peer-reviewed measurement... theirs studies a different country. No new arguments about the topic itself; the duel is only about whose evidence deserves to be believed.
Go three rounds each, then get a verdict from a third teammate if one is available. More and more rounds are decided by evidence comparison, and its vocabulary can be learned. This drill builds it faster than anything else.