Like most Magic: The Gathering cards, the value of Gold-Forged Sentinel depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Battlebond)
However, you can consider playing fewer than four copies of a card if: It gets worse in multiples (such as legendary creatures) It's only useful against certain matchups It's a win condition, and your control deck will have time to dig through the deck and find it You're stuck choosing between two cards which have equally strong, similar, but slightly different effects (you could play two of each) It's a slightly worse version of a card you have four copies of already, and you're including it because you want even more of that effect
The book side is sometimes relevant, especially when converting to your janky infinite mana and storm wins via Hullbreaker Horror and Jadzi, Oracle of Arcaivos, but in my experience, youre more interested in bouncing the book back to your hand than actually using it
While paying 2 mana for a token copy of a cast spell is a pretty good rate, it doesnt matter if the creature its on isnt efficiently costed itself
Protect your heroes with confidence
PSA Population: 990 (10) (9) 476 Current Pokmon Card Value: PSA 10: $13,100 PSA 9: $2,226 10