Since non-basic lands exist, this is very easy to do, allowing Hermit Druid to be an incredibly consistent combo
Yes, you lose some life every turn, but The One Ring is also indestructible, making it extremely difficult for your opponents to interact with, and you really should have some bounce spells to maximise the potential of The One Ring (and to not lose too much life)
None of the one drop or two drop "Tap for any color of mana" things are cheap like Birds of Paradise or even things like Noble Hierarch that taps for three are cheap either
That said, this deck's theme was one we settled on last, with even the face commander taking more time to select than usual
This card is a three mana Artifact that can tap to add one mana of any color, but its main ability is that it also grants this effect to all of your Lands
Two-Color Signets I like talismans a bit better, but signets are a vital set of 2-mana mana rocks, in some ways the bread and butter of the Commander game