Fear of Change, a 2-drop Simic creature from Alchemy: Duskmourn
#13 Sapphire/Steel Ursulas Return Despite being the stronger of the two starter decks released in Ursulas Return, Sapphire/Steel is not the greatest of all time
There are heaps more, even more so when you think about all the old cards in the Through the Ages sheet
In a two-player game, Secret Rendezvous is worse than playing no card at all, but in a four-player game, its a great way to start an alliance to join up against a common enemy
As chance would have it, Banzai works well as both a challenger and a quester
Decks like The Wise MothmanThe Wise Mothman, Captain N'ghathrodCaptain N'ghathrod, and The MindskinnerThe Mindskinner will want The Water CrystalThe Water Crystal the most, as it turbo charges their milling shenanigans quite a bit