These final three may not be considered as widely versatile — or at least, not a staple in multiple archetypes — but they're still a flexible option to craft.
Ember Maiden has been overlooked so far, as everyone is playing Bilgewater decks, but the ability to damage the Nexus on multiple turns being attached to a follower is a big deal, and this card will definitely be relevant when the meta settles.
Pool Shark is a nice, cheap 1-drop that helps you set up to draw next turn. It's seen a lot of play in early builds of a few archetypes, and the Common rarity means it's cheap to craft.
Finally, Zap Sprayfin is Rising Tides' equivalent of Shadow Assassin — a staple in many existing decks. It's a relatively cheap Elusive that draws you a card, and this will see play in quite a few Bilgewater decks for that reason.
That's it for the best cards to craft in Rising Tides. For more on Legends of Runeterra, check out our dedicated page for a range of useful guides aimed at all skill levels!