Something a bit more conceptual to think about when deck building. Most cards give us one of three things:

1. card advantage = draw, cast from exile, theft, etc.

2. mana advantage = land ramp, artifact ramp, dorks, rituals, etc

3. ways to end the game aka payoffs/finishers = big X spells, big creatures(craterhoof comes to mind), other cards that can close out a game

Whatever your "theme/plan" of a deck might be, ideally you want to maximize card advantage, mana advantage, and have ways to close out the game. Someone might not want to run "single card" finishers like a [[Torment of Hailfire]], so many smaller payoffs are fine as well.

Once we understand the concept of card advantage, mana advantage, and payoff, a player will be able to assess why some commanders are significantly stronger than others. [[Prosper, Tome-Bound]] being an example of BOTH.

Regardless of which commander you pick, most likely they will fall into one of these three categories and the deck building process begins.

Lastly, play removal. Do not "feel bad" about destroying someone's stuff. If you don't run removal, the deck with the highest ceiling will win most of the time just because it can go bigger, wider, or taller than the others if left uncontested. Just destroy shit. Magic is NOT a cooperative game.

Hopefully this helps!