If an effect instructs you to return it to the battlefield transformed when it leaves the battlefield, it won't return and will remain in its new zone
While exact odds vary by product, estimates generally put the odds of pulling any specific SIR at roughly 1 in 100+ packs
PSA's census shows only 4 total examples of this piece have been submitted for grading
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The Earth Crystal and [[The Darkness Crystal]] are the standouts
Kayas Ghostform is also good here, though not quite as good, given the creature will leave play dropping off all Equipment, and losing all other Auras