i had this though at the back of my mind for a long time, i was even thinking of a creature with the ability to remove immortality of another creature but then i thought it was too situational for such a creature.
though i agree on the situational part of this, pretty good idea but since "Immaterial" is mostly the property of
and
, why would they themselves remove their own immortality? i reckon the element of the card should be changed, perhaps
? or
?
i dont know but thats how i see it, otherwise the player is forced to use the very same element to mortalize something of the same element once again.