Though the dinosaur craze of the early 1990s -brought on by the release of Jurassic Park has abated somewhat in the intervening 30+ years, Dino kindred support is a relatively new addition to the world of Magic: The Gathering
And the deck isn't even technically an Elf deck, but with 12 one drop mana making Elves, plus 4 Priests, and 4 Circles, you have 20 Elves that tap for mana, then flesh out your deck otherwise
or their own libraries, as Perpetual Timepiece has the ability to mill its own owner's library into their graveyard
Delighted Halfling Green has enough mana dorks that they need to do something special to stand out from the crowd
"Episode 6: The Ballad of Thieves and Thunderslingers" As usual with Oko's plans, chaos ensues in Tarnation
That means when the time comes for a year's worth of cards to drop out of Standard, they will lose legality in Alchemy as well