During your opponent's next turn, whenever 30 or less damage is done to Onix (after applying Weakness and Resistance), prevent that damage. (Any other effects of attacks still happen.)
“As it grows, the stone portions of its body harden to become similar to a diamond, though colored black.”
How much is Onix #56/102 worth?
A raw copy of Onix #56/102 (Base, 1999) is worth about $1.20 right now, based on the latest market data from November 5, 2026. Across the 3 printings we track, copies run anywhere from $0.18 to $662.34 depending on the version you're holding.
Grading changes the math on this one: a PSA 10 is valued around $156.05, roughly 130.0x the raw price, while a PSA 9 sits near $33.89. 2,631 copies have been graded to date, and 21% of them came back a 10 — worth knowing before you pay grading fees.
Prices on this page refresh nightly from live TCGplayer market data and are cross-checked against actual sold prices, so a single inflated listing never becomes "the price". The chart above has the full history.