Its current prices dont quite reach Blastoises, as a 1st edition, holo, shadowless, grade 10 Venusaur can be purchased for $6,000 (or $1,800 for a grade 9)
While his X effect is O counter, with only 480 HP opponents will probably stick to some T or X they can boost to over 500, and his support effect only boosts one of your attacks by 200 instead of all of them like Biyomon
Like most Pokmon cards, the value of Cornerstone Mask Ogerpon depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Destined Rivals)
Only a (very fitting) 1510 copies were ever produced
It does everything: It enables the strategy, its a payoff, and if you can turn it into Sephiroth, One-Winged Angel, which gives you an emblem for the rest of the game