In my years of personal experience, examining good decklists, and talking to people much smarter than me, 50 mana sources is about the right number for most decks to shoot for, usually 37 lands and 13 ramp sources for a general budget deck
The untap trigger lets you reuse all your mana dorks, from Bloom Tender to Birds of Paradise, for a ton of mana on each player's turn
Rafiki Shaman of the Savanna knows something about an Owl, and a Snake as well
Indeed, a Magic: The Gathering screen adaptation is in the works, but audiences shouldn't be too surprised to see that this will not include the many other universes that have begun to bleed into this continuity
Not only that, but you can attach one to a samurai right away
Meanwhile, Fynn, the Fangbearer was printed in Foundations , which will be Standard-legal until at least 2029, so its Vayne Carudas Solidor alternate version is also Standard-legal until then