Its personal, and the process it changes a lot depending on your intentions
Oliver only had a single Teferi in the sideboard, so he could have played four instead of adding a color if he just wanted three-mana planeswalkers, but Oko is enough better to justify adding another color and playing a maindeck Breeding Pool in his Jeskai deck
I wouldnt be surprised if you saw it at #SCGINDY
Green Stompy decks are most common in Standard, where formats tend to be slower and fairer
Based on my research and experience tracking thousands of Pokemon card sales, three critical factors determine whether grading will boost your card's value enough to be worthwhile: "The three main components that determine a card's value are rarity, condition, and popularity
Silumgar's Command I may have already spoiled the fact that all the gold commands make this list