Anyway, back on topic, all Ramp decks since the beginning have looked to build their mana to ridiculous levels as quickly as possible and then use that advantage to drop more powerful win conditions earlier than their opponent and ride that to victory
Like Return of the Wildspeaker, you can pay five mana (if you foretell it) to draw a ton of cards if you have a big enough creature, and like Inscription of Abundance you can gain lots of life while you're at it
Combine that with only 2 PSA graded copies in the database, and you can see why it fetches so much at auction
The cards in this category are not any less important than the other cards its just that due to the recycleing and searching nature of the architype they can be used multiple times and not bog the deck down ) 1x Eternity I really like 2 of these in the deck but space made it go down to
Born of the Luxa bank reeds in Naktamun, he rose from sparkling water in wake of the Phyrexian invasion, equipped with a bow like Oketra's and the head of a proud lion