No one would have guessed that the 1998 Pikachu Illustrator card would sell at $5,275,000, sold to one Logan Paul
Candlestick seems the best because of the surveil ability, with Knife the next best thanks to its first strike ability
Since they come with card draw, you don't lose card advantage, and when Zander isn't on the battlefield, you can just target an opponent's creature to effectively use it as a 1-mana cycling effect
It's easy to consider mentorship as one way, akin to teaching, where the "experienced" one passes their knowledge to someone else
The discount which Gargos provides is significant, especially for Hydras with X in their mana cost, but Polukranos, Engine of Ruins ability to generate tokens also shouldnt be underestimated
Generally speaking, the best way to go is eBay or TCGPlayer if you have the determination and time to get the most money but selling to stores is good if you are pressed for time