If you play one card and your opponent plays one card to remove it, you are "even." However, the player who can consistently use one card to deal with two of their opponent's cards will almost always win
Syr Konrad, the Grim Syr Konrad, the Grim primarily serves as the win condition for a deck leveraging cards like Mesmeric Orb to make everybody mill cards
Staple lands play a vital role in shaping the mana base of your Commander decks, providing essential mana fixing and ensuring consistent access to the colours of mana needed to cast spells
Time travel says, "For each suspended card you own and each permanent you control with a time counter on it, you may add or remove a time counter." So, you can put out cards like Judoon Enforcers, Star Whale, and Atraxi Warden out early
That isn't the only difference between the two, though