You likely passed on one or two higher quality picks to get here, but youre not hosed, as your deck functions completely without the Mill engine
Youll want to be jamming with Yuna, Hope of Spira (just like the potential new best deck in Standard!), use Sanctum Weaver for big mana plays, and take advantage of the many enchantress card draw options, from Sythis, Harvests Hand to Enchantresss Presence
Gilgamesh offsets all of the downsides to playing equipment, and can create tons of value
Decks that care about lands (The Gitrog Monster) and self-mill are eager to count with this turtle in EDH
If I were doing this in a rotisserie I would likely draft some anti mass removal sideboard tech like Second Sunrise or just Hallowed Spiritkeeper in addition to running Selfless Spirit main
Pick out your favorite creatures you want to bring back like Sheoldred, Whispering One, put in as many reanimation engines as you can, and youre ready to go