The extra land part of the card wont always matter, since most of the time when you start using this ability youre probably not going to be in desperate need of more lands, but it could definitely help, especially in UG, which is a ramp color pair as it often is
Thirst for Knowledge: At least some of the time, you will be able to draw three cards with Thirst for Knowledge and discard an ther Vial or Grafdigger's Cage, netting you that extra card
Every Wilds of Eldraine Set Booster contains at least 1 Borderless card
And when you need to clear the battlefield, Deadly Vanity lets you keep your best creature or planeswalker while sweeping away everything else
This is still under the level of cEDH decks, which while likely containing similar pieces to those of Level 4, are optimized for the most efficient, consistent victories possible