When you activate "Contract with Exodia", and your opponent chains "Disappear" to remove a piece of Exodia from your Graveyard, you still Special Summon "Exodia Necross", but "Exodia Necross" is then destroyed because of its effect.
When you activate "Contract with Exodia", and your opponent chains "Disappear" to remove a piece of Exodia from your Graveyard, you still Special Summon "Exodia Necross", but "Exodia Necross" is then destroyed because of its effect.