Slightly Lost Boy Being Evasive is a plus, but theres not a lot else going for this particular card, unless you really need an Evasive character with four strength
We have 28 years of draw-then-discard spells to choose from, and we should almost exclusively be playing them as our card selection tools in a Sefris deck
Yes, it can counter things for two mana, but outside of Geist of Saint Traft or Geralfs Messenger when youre on the draw, thats not something you really need to do
From, this perspective, Invasion of Arcavios is overcosted by one or two mana, as compared to cards like Cunning Wish, Burning Wish, Mastermind's Acquisition, and Solve the Equation
The Fracture Foil version of one of the most-played mana accelerators in Commander history is going to be a chase card for a long time
Also, he's very strong at playing defense with his instant speed able Phasing out and if you can protect him, you can win fast in a multiplayer game, and the more in the game the better he is