Creature — Illusion 1/1, U (1)
Uncommon
Flying
Jace's Phantasm gets +4/+4 as long as an opponent has ten or more cards in his or her graveyard.
In the abstract memories of the Iquati, Jace found interesting ideas to improve upon.
Illus. Johann Bodin

7/1/2012: The last ability constantly monitors each opponent's graveyard to see if the bonus applies. If the stated condition becomes no longer true, the bonus immediately stops applying.
7/1/2012: In a multiplayer game, a single opponent must have ten or more cards in his or her graveyard for the bonus to apply, although this opponent may change over the course of the game. You don't have to pick a single opponent; the ability will monitor each opponent's graveyard.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Extended (Type 1.X)
Legal in Standard (Type 2)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern