also, i think the $4s may be the most interesting group to debate. a good number of cards that have fallen (sea hag) or risen (remake, herald, ironmonger) as the game's evolved.
personally i don't see much of an argument for herald over wandering minstrel. WM just does so much to accelerate your deck in the early going (whereas herald struggles with the junk cards), and it's *especially* key for engines without trashing. the latter is big in my mind, as i've come to see those as some of the main games that separate top players from the rest. heck, i'd probably put ironmonger above herald just because of how much better it is at the beginning - i'm finding that the early game matters more than the end, more often than not.