Theres nothing saying that Wilds of Eldraine cant push this mechanic further by adding adventures to other permanents like enchantments or even battles
With the new mechanics covered, let's dive into the cards
Drown in Dreams If you have a big or infinite combo engine, Drown in Dreams is a finisher
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No, menace is not an activated ability, it is a keyword ability that is static and requires no resource cost
We really can't imagine any other reason a Kingdra would be one of the most wanted cards, but then again the trading card world isn't one of the most sensical ones