Laelia Exploit
No idea, but Laelia is 105/105 on turn 6 and there's nowhere near enough cards in exile or GY to make it make sense.
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JackTupp#06908
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Rezzahan#77802 commented
Cascade and discover exile cards, but then put them back into the library. And because those abilities do so one card after the other, Laelia triggers for each of those that are lands.