Not only does the pair pack solid base stats, it also draws a card when it enters play and attacks, with the option to discard lands as well to remove problem creatures
Once you get back to Pioneer or Modern, Nature's Rhythm is competing directly with cards like Green Sun's Zenith, Chord of Calling and Finale of Devastation, which means you are going to need a specific reason to play it over the other powerful options
Llanowar Elves Showcase (Fracture Foil) The OG Mana Dork, Llanowar Elves was part of the very first MTG print all the way back in 1993
Of course, you can get inspiration from the internet
However, once your graveyard meets the threshold requirements, you get a 5/5 creature with protection from black and flying for only four mana