It gets a single-turn pump for every instant or sorcery you play
Goliath, for instance, forces both players to discard their hand until they have two cards left
Because this a Standard set that's built to draft, there does feel like there is overlap in what some of the legends do, but that just means you can personalize your approach
Stack up your pile of Eldrazi, your mana-producing artifacts, and your All is Dust so you can wipe everything but your creatures and decimate your opponents (or at least their dreams of victory)
Furthermore, the fact that you can get anything back from your graveyard is always a huge benefit
However, when I played Gonti, I saw a Lyra and knew he could become more controlling after sideboarding if he wanted to