+1: Empower Jace X, where X is the number of Islands you control.
−3: Until your next turn, whenever a creature attacks you or a planeswalker you control, it gets -5/-0 until end of turn.
0: Exile all but the bottom card of each opponent's library. Activate only if there are twenty-five or more loyalty counters among Jaces you control.
Jace, Reality Sculptor has 3 listed printings; the most valuable is the Promo Pack printing from PFRA at US$2.23 on TCGplayer's market price. Prices below are the cheapest in-stock listing in the United States.
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