I use a Thief of Insanity and exile a Kroxa, Titan of Death's Hunger from my opponent's deck. I cast Kroxa, but then of course would have to sacrifice it because it wasn't escaped. Would it go back into my opponent's graveyard or mine? Am I able to escape it without the correct mana still?

I use a Thief of Sanity and exile a Kroxa, Titan of Death's Hunger from my opponent's deck. I cast Kroxa, but then of course would have to sacrifice it because it wasn't escaped. Would it go back into my opponent's graveyard or mine? Am I able to escape it without the correct mana still?

So if I use a thief of insanity to procure a "Kroxa, Titan's Death Hunger" Play him but of course I would have to sacrifice it if it wasn't escaped. Would it go back into my opponent's graveyard or mine? also am I able to escape it without the correct mana still?

I use a Thief of Insanity and exile a Kroxa, Titan of Death's Hunger from my opponent's deck. I cast Kroxa, but then of course would have to sacrifice it because it wasn't escaped. Would it go back into my opponent's graveyard or mine? Am I able to escape it without the correct mana still?