That scarcity has driven this card to huge new heights
Establish a handful of elves or faeries and the more you control, the more spells you can play from among your opponent's cards
Unbans are a delicate balance, just like bans, and one persons oppressive deck is another persons favorite
God-Eternal Oketra another card with a ton of potential
With proper sacrifice outlets, you can even remove their creatures entirely for your own benefit
We can also use Wrenn and Seven or Nissa, Vital Force to return permanents from our graveyard to our hand, which can lead to some really weird legend-rule loops where we play multiple Ugin, the Spirit Dragons or Nissa, Who Shakes the Worlds, use their abilities, with each copy legend-ruling away the first, return them all to our hand with Wrenn and Seven, and eventually kill our opponent with Ugin damage or a massive Nissa, Who Shakes the World land (which gets especially massive thanks to the extra counters from Doubling Season)