It is basically just a good value one man army card that floods the board giving you good control defensively as well as offensive options
There was no production log for this card, so the rough estimate for how many Ishihara GXs there are range from 30-200
Opening these packs means hitting any borderless rare in just under 8 of 10 packs, and getting one of the five Commander = free spells every 8th pack or so
There are additional special rules for deck building
All in all, Doubling Season is a stellar reprint, no matter which way you look at it
Set this card (but banish it when it leaves the field), and if you do, return that face-up card to the hand, but for the rest of this turn, you cannot activate cards, or the effects of cards, with the same name that card had once it returned to the hand