Karn reshaped the Mirari from a power-warping world probe (see Odyssey block) into Memnarch. Tossing the Mirari into the core would just make it float around due to wonky gravity or hand it to the Phyrexians who are doing their thing there.Ok for one, arguing with the Statement that Karn is at a different power level then Planeswalker. It doesn't matter, all they have to do is through the Mirari? Right? Hope I spelled it right... I they have to do is throw it into the core for it to maybe revert back into Memnarch.