Using it right after a Windfall where you force every player to discard and draw 20 cards is a surefire way to get ahead, but even if you only get three mana back, you'll get all the cast triggers from your permanents for free
Like most Magic: The Gathering cards, the value of Draugr Necromancer 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 (Kaldheim Promos)
Like most Magic: The Gathering cards, the value of Vadrik, Astral Archmage 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 (Innistrad: Double Feature)
And Asari Captain gives your lone Samurai/Warrior a power boost equal to your entire army
Deck Value Strong cards for commander-focused decks
It's a question that many collectors have asked themselves, and the answer isn't always straightforward