The last ability of Jaceâ€™s Phantasm constantly monitors each opponentâ€™s graveyard to see if the bonus applies. If the stated condition becomes no longer true, the bonus immediately stops applying.
In a multiplayer game, a single opponent must have ten or more cards in their graveyard for the bonus to apply, although this opponent may change over the course of the game. You donâ€™t have to pick a single opponent; the ability will monitor each opponentâ€™s graveyard.
If Jaceâ€™s Phantasm is dealt lethal damage at the same time as an opponentâ€™s creature, and that creature will become that opponentâ€™s tenth card in their graveyard, Jaceâ€™s Phantasm will be destroyed before it gets +4/+4. This is because all creatures that have been dealt lethal damage are destroyed at the same time.
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