Quote from Mishichi »Champion of Rhonas is almost strictly inferior to Elvish Piper, which is already not great
Manglehorn seems like a fine inclusion. However, Reclamation Sage had Elves synergy (Wirewood Symbiote and Priest of Titania mainly), so I think it's a pretty close call between the two. I don't think it's necessary to run both however. I'd say the faster the meta, the better Manglehorn becomes. If games get grindy, repeatedly bouncing Reclamation Sage is pretty powerful.
I agree. I do think Manglehorn is a good card but anytime that I would be fetching a 3cmc creature, 99% of the time I am going for Azusa, Lost but Seeking, Eternal Witness, Reclamation Sage, or Selvala, Heart of the Wilds.