That argumentation applies even more to Legacy than Modern since you clearly see Expressive Iteration being extraordinary in Delver, good in Control and non-existing in absurdly strong combo decks like Storm, Doomsday or Sneak & Show
Bitterblossom definitely deserves an honorable mention, of course
Introduction to the Necron Dynasties MTG Precon Deck Weve had the Necron Dynasties precon on the table for a good stretch now, and the first thing that stands out is how little you have to do to make it work

Acorn Catapult Acorn Harvest Acornelia, Fashionable Filcher Animal Friend Cache Grab Camellia, the Seedmiser Chatter of the Squirrel Chatterfang, Squirrel General Chatterstorm Chittering Doom Chitterspitter Cloakwood Hermit Comet, Stellar Pup Deep Forest Hermit Deranged Hermit Drey Keeper Druid's Call Earl of Squirrel Form of the Squirrel Hazel of the Rootbloom Honored Dreyleader Liege of the Hollows Mistakes Were Made Mudflat Village Nantuko Shrine Nested Shambler Nut Collector Oakhollow Village Ravenous Squirrel Rootcast Apprenticeship Scurry Oak Snickering Squirrel Specimen Collector Squirrel Dealer Squirrel Farm Squirrel Mob Squirrel Nest Squirrel Sanctuary Squirrel Squatters Squirrel Stack Squirrel Stack Squirrel Stack Squirrel Stack Squirrel Stack Squirrel Stack Squirrel Wrangler Steel Squirrel Swarmyard Swarmyard Massacre Sword of the Squeak The Odd Acorn Gang The Unbeatable Squirrel Girl Thornvault Forager Trendy Circus Pirate Underworld Hermit Valley Mightcaller Vedalken Squirrel-Whacker Verdant Command Wrenn and One (playtest)

A few cards saw some play, but when we had our initial meeting for Lorwyn Eclipsed and looked back at mechanics from the Lorwyn and Shadowmoor blocks, our note on champion was that it would be nice to do again if it played a little better
And when theyre respectable cards to cast later in the game, even better