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
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Roughly one third of the time you receive a non-foil Multiverse Legends card, it will be a rare or mythic rare
From banishing troublesome characters to helping you fill your side of the table with powerful characters, Rise of the Floodborns best action cards keep your rival players on their toes and give you ways of responding to threats quickly or putting your opponents in difficult positions
Peace Offering will be a classic group hug deck in Green/White/Blue, which gives all of your opponents benefits such as card draw, +1/+1 counters or tokens while remaining mostly non-threatening
Combine that with a fun game, collectibles popularity, and a good price point, and it really worked