Half of it wants to be a one- or two-of, but it might just be so game-ending that you want to push up to three or four copies
When I brought up the fact that we needed to produce an Unhinged FAQ(TIWDAWCC), the rules team left skid marks getting away
The combination of card draw, creating a token and the pervasiveness of wizards in Magic adds a lot here
I would maybe consider some tapped duals that have basic land types so you can have a swamps or islands for domain without banking on drawing Nylea's Presence
Adding mana rocks like Mana Crypt and Mana Vault will help speed up the initial ramping turns that are needed for this deck to start copying a ton of Adventure spells and bury your opponent in value
To squeeze all of the value you can out of this big Dinosaur, flicker effects, like Deadeye NavigatorDeadeye Navigator, Essence FluxEssence Flux, and Ghostly FlickerGhostly Flicker, are great additions