Those of us who tried it have found varying success: Jason Waddell has written articles on it and I've personally found the archetype to be fun
Either way, you get an advantage from it but I think this is the better Retreat for this deck
In an enchantress deck, she's regularly a 6/6 or 7/7 by the time she attacks, which gives you a backup win condition on a card that's already pulling its weight as a draw engine
This Magic: The GatheringFINAL FANTASY Scene Box, Children of Fate, contains 6 traditional foil borderless scene cards, 6 art-only scene cards, 3 Play Boosters, and a paper display easel
All you need is a card like Heartstone or Zirda, the Dawnwaker to reduce the cost of Sliver Queens effect, then cards like Earthcraft or Gemhide Sliver + a haste enabler, and you have access to infinite 1/1s
The Lord of the Rings: Tales of Middle-earth set gave this commander a nice boost with cards like Mirkwood Bats and Rise of the Witch-king