What makes fetches so critical and important to Commander and other competitive formats is their ability to retrieve a deceptively wide variety of cards in a given deck
For example, if Narod, the Beige Flower and Doran, the Siege Tower ("Each creature assigns combat damage equal to its toughness rather than its power") are both on the battlefield, each time a creature would deal combat damage, that creature's controller chooses whether it assigns combat damage equal to its mana value or its toughness
Since there are fewer potential blockers, ambush creatures like Goblin Grenadiers, Goblin Vandal, and Orcish Squatters are on the table
More surveil payoffs
I think I like Necro-brand, lets go with that
Pokmon cards rise into the air to deliver attacks, and the board lights up with a neat flourish corresponding to the Pokmons elemental type