The fact that the token enters tapped and attacking helps you apply pressure in a Typal deck devoted entirely to doing just that
Since there are fewer copies of Greninja ex out in the open, that's likely caused the price spike but as the set ages, it'll probably level out to a more reasonable amount
Ultimately, Ive found steel to be fairly metagame dependent working well as a supporting ink, but tends to fall flat in the starring role
So its no surprise to see it at the top of our list of the most valuable Japanese Pokmon cards
Older sets, on the other hand, are less desirable, because they've already been on the market for a while
Green Uncommons Berserk $100/$60 Ice Storm $40/$20 Regrowth $40/$20 Channel $20/$10 Hurricane $12/$6 Instill Energy $10/$5 Camouflage $8/Unlisted Lure $6/Unlisted Thicket Basilisk $6/Unlisted ALL OTHER GREEN UNCOMMONS $5/$1 Channel seems really cheap compared to this other stuff