The one potential exception here is Pia Nalaar, which, while she does not technically have improvise, does provide a healthy set of stats and a relevant ability
Who knows, maybe Glimpse of Tomorrow or Reanimator decks would quickly define the metagame if it was not around
Namely, the ability to make each of your lands produce an additional mana every time you tap them
Creative Energy and Creative Energy Collector's Edition 0003_MTGMH3_CmdFace: Satya, Aetherflux Genius 0006_MTGMH3_CmFeatur: Cayth, Famed Mechanist 0146_MTGMH3_Vanity: Satya, Aetherflux Genius 0142_MTGMH3_ComPorEc: Satya, Aetherflux Genius 0137_MTGMH3_ComPorEc: Cayth, Famed Mechanist 0150_MTGMH3_EclVanty: Satya, Aetherflux Genius Check out the cards from Creative Energy and Creative Energy Collector's Edition in the Modern Horizons 3 Card Image Gallery
And then Invasion happened and with it a clarion call for better creatures
But you cant have two of the same keyword on a character, see below