Each of these cards has powerful effects, so you can use only one Ace Spec card in your deck
Whats nuts is that this card can very easily just cost two green mana to cast, since you can remove +1/+1 counters to shave off two of the ten generic mana in its mana value for each one you remove
Card draw staples like Teferi's Ageless Insight can draw two cards off of each Candlekeep Sage trigger instead of just one
With its Basic stage classification and 100 HP, it's ready to take on any challenge in your deck
Is there a website with a list of successful deck lists from the Hall of Fame format (like ptcgarchive), a more professional list of viable deck lists with brief strategy help (like Jason Klaczynskis blog), a tier list (ranking list?) for successful decks, or even a set of detailed tournament reports which I could examine
They are Beckett Grading Services (BGS), Certified Guaranty Company (CGC), and Professional Sports Authenticator (PSA)