There are a number of resources out there that allow you to plug in your decklist and get a breakdown of what percentage of your cards need specific colors of mana, what the average converted mana cost of your cards is, and other helpful information (Im partial to Tapped Out personally)
Collector Boosters are much more expensive than Play Boosters
Of course, one of those players could be you, giving you an erasy way to both get yourself ahead and curry the favour of everyone else at the table
While that's highly unlikely to happen, garage sales can be a great place to find old collections or bulk with hidden treasures sprinkled inside
Zimone, Mystery Unraveler Zimone, Mystery Unraveler is a bit limited since it needs two triggers in a turn to flip your permanents face up for free
Steel is also built for defense, with characters that boast Resist and Bodyguard abilities, making them particularly resistant to enemy challenges