Both Guidelight Pathmaker and Voyage Home accrue card advantage efficiently, as long as you can keep your decks artifact count higha task made easier by the abundance of artifacts in the set
On the second turn, you play two more Elves
But going back further, we have self-mill powerhouse Mesmeric Orb, Commander option Merieke Ri Berit, and a bunch of very underrated cards from Born of the Gods
Ambrosia Whiteheart Champion of the Clachan Dust Elemental Flock Impostor Jeskai Barricade Loyal Gryff Mischievous Pup Night Nurse, Healer of Heroes Otherworldly Escort Phelia, Exuberant Shepherd Rescuer Chwinga Restoration Angel Rhys, the Evermore Salvation Swan Samwise the Stouthearted Stonecloaker Sunpearl Kirin Vizier of Deferment Whitemane Lion
Its the only Enchantment to crack the top ten but its not hard to see why
These creatures return if Savior of Ollenbock leaves the battlefield, too, so you can manipulate this as you'd like for the greatest effect