Tricolor gold cards or cards with hybrid mana are pretty rare in MTG, and these days, theyre almost always legendary creatures for Commander
If your Commander deck doesnt have access to black and its array of universal tutors, focus on choosing low mana value tutors that fit in well with your strategy (for example, dont play Idyllic Tutor when your deck only has 4 enchantments unless theyre of critical importance)
5/5 flying that draws a card is nice, and when you can choose a specific card that will help you the most, its even better
Why not recontextualize some of Magics most notable artifacts to fit into a brand new world
Or in other words, can you just ignore what the card tells you as long as you do something kinda close
Rarity wise, youre likely to find cards with the L designation in every other pack of boosters that you open