Bitterblossom definitely deserves an honorable mention, of course
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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
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
Commander has many ways to go infinite, allowing for games to end quickly by casting certain spells over and over again
And when theyre respectable cards to cast later in the game, even better