You can take their turn, get all their creatures tapped, spend their removal, tap all of their lands, and otherwise mess with them to leave the way open for your win
Plus, the character himself has some serious Dune vibes between this card and his other, blue-black iteration, if only by echoing Paul Atreides aesthetics
Obviously, you can take the deck further: adding stronger more powerful elf tribal cards that far outstrip our budget today, or simply following one of the more linear paths, like +1/+1 counters or Aristocrats
Vigilance Radiant Grace and Sentinels Eyes both grant an enchanted creature the vigilance ability, and then throw more bonuses on top of that
Curse of Opulence
This guy is a card that can work similarly being a two mana personal effect and although he is less powerful than sunscape familiar he is much more widely useful