WUBRG decks are always a little tricky to judge if they're not blatantly powerful right out of the box, and because the theming of this deck is so cool, it feels disruptive to try and make upgrades to it, so it's almost a case of being a precon that you shouldn't upgrade, but yet it desperately needs it
Stegron the Dinosaur Man Rating: 3/10 Stegron the Dinosaur Man is both a weak 5-drop creature and a weak combat trick, but combine them both into the same card and it does become playable, much like Ironhoof Boar in the past
Artifact Mox Tantalite Suspend 3 (Rather than cast this card from your hand, pay and exile it with three time counters on it
Typically, I try to think about an upcoming plan and leave effects in my graveyard rather than particular cards: draw spells, protection, tutors, mana, and bombs