Captain Lannery Storm's last ability triggers whenever you sacrifice a Treasure for any reason, not just to activate a Treasure's mana ability
As a baseline example of how messy this can get, imagine playing Dark Depths and sacrificing it to, say, Crop Rotation
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This wouldnt normally stop an unearthed creature being exiled, but it literally has a clause on it that means you can get around that
This only applies to scheduled side events
As I stated in that article, lands and hybrid spells are exceptions here, though I was hopeful for some absurd Naya card to really shake things up