Man is this an old thread lol, came across it looking for something else regarding Squee's toy, but i'll provide my insight from reading the books and being an avid player of the game and what not. I feel like Squee was inherently immortal before Crovax claimed Yawgmoth made a gift of him (Squee) for Crovax to kill over and over again. The reason I think this is because of his card in MM, which has you returning Squee to your hand from the graveyard at the beginning of your upkeep was a whole block before the Invasion and implies that he is already immortal. I feel like Squee's Toy, which is the Salvation Sphere (piece of the Legacy) has a part to play with this and somehow augmented Squee's soul. I just don't see how Yawgmoth could make Squee functionally immortal outside of Phyrexia, why not do this with all his minions? I think , like others have mentioned, that Yawgmoth realized Squee was immortal, couldn't obliterates him out of existence, and just gave him to Crovax to "deal" with. So yeah, I think Squee already possessed immortality, and I think it had something to do with the Sphere resonating with his soul somehow.
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