You want to focus on big, impactful creatures that really shake up the board state upon entering the field, and who can continue to disrupt the game as long as they are on the field (or, possibly, by coming back from your Graveyard again, and again, and again) Protecting Yourself from an Early Grave, and Knowing Your Match-ups Reanimator decks also dip into forms of spot removal
Mox Amber is very unlikely to do anything in a fully colorless Commander deck
She decided to target a top-secret Futurist workshop, but she was caught by the head researcher
2000: Phyrexian Altar After the insanity of Urza's Block, Magic's designers calmed down on the busted Artifacts for a few years, and the turn of the millennium saw only a few powerful Artifacts
This card is very difficult to destroy because in order to hit it with a removal spell likd Swords to Plowshares or a Doom Blade first another Instant, Sorcery or Artifact must be wasted in order to disarm its counter effect
But if youre one of the many players who doesnt have a mono red Commander deck, the lack of cards like this is the reason why