The other piece of advice I have gotten from more seasoned collectors is simply taking a step back and revisiting the things you have already acquired (this is why binder collections or wall displays, for example, can be so useful)
(11/10/2020) To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases (such as the commander tax), then apply any cost reductions (such as that of Dargo's first ability)
Leaving Mega Beedrill ex out means other Pokemon from Legends: Z-A will have the opportunity to get Mega in Ninja Spinner
For evasion, the same equipments as we dicussed with Tinybones above are options, although having access to blue gives you some extra tools like Thassa, God of the Sea or Aqueous Form
Proxies is not the right term for what we support, because people sometimes use that term to refer to counterfeit cards
Graded Population Report: Charizard V #17 Visualize the distrbution of grades in the chart