The reason for this is most likely due to the budget-friendly nature of the card, and the slight upside Sidisi gives to a deck looking to mill itself
It cant compete with fast mana like Sol Ring, but fair decks rarely do much better
At worst, you can cast this on-rate for four mana, but its very reasonable to see this costing you only two mana a good amount of the time
That said, now that UW Caw-Gates won the event, I might consider running one Essence Scatter in the 75, since Skred has virtually no answer to Guardian of the Guildpact
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Drafting a Deck In Sealed Deck you open six packs and in Booster Draft you only open three