Of course, if your opponents have a fetch land, theyre going to get the trigger regardless In many ways, this feels like a blue upgrade to [[Archivist of Oghma]]
Not only can this quickly cause your opponent's creatures to evaporate, but whenever a creature with a slime counter on it dies, you also create a 1/1 slug token
MDFC Lands After Modern Horizons 3, every color has access to multiple modal double-faced cards with lands on the backside that enter tapped unless you pay 3 life
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Prosperous Innkeeper is also pretty solid once we get Skeletal Swarming or Death-Priest of Myrkul on the battlefield, giving us a source of incidental lifegain as our Skeleton tokens enter the battlefield, which is especially strong against aggro
She also happens to be in the two colors where Hydras are the most concentrated, and most Hydras have X in their casting cost