Hobbyist magazines, already tracking prices of sports trading cards, engaged with the Magic secondary market by surveying the stores to inquire on current prices to cards, which they then published
We were sent a Set Booster box, which contains at least one rare, or mythic rare card, and a guaranteed foil and art card, by Wizards of the Coast
Thats why effects that cheat on equip costs are so valuable
TCGplayer lists the market price of a rainbow foil Everyones Invited precon around $300
They will still be playable in Historic Brawl
Omastar #43Uncommon $1.22 Pupitar #45Uncommon $0.91 Kabutops (25) #25Rare $11.03 Houndour (5) #5Holo Rare $92.22 Dunsparce #54Common $0.68 Omanyte #60Common $2.28 Scizor (29) #29Rare $13.18 Unown [U] #51Uncommon $1.99 Forretress (21) #21Rare $7.14 Politoed (27) #27Rare $18.74 Pokemon 2-Player Starter Set (Revised Base Set Reprint Run) $239.40 Base Set Theme Deck - "Blackout" (Revised Base Set Reprint Run) Base Set Theme Deck - "Zap!" (Revised Base Set Reprint Run) $499.95 Base Set Theme Deck - "Brushfire" (Revised Base Set Reprint Run) Base Set Theme Deck - "Overgrowth" (Revised Base Set Reprint Run) $685.00 Base Set Booster Pack [Revised Unlimited Edition] $786.87 Base Set Booster Box [Revised Unlimited Edition] $499.99 Base Set 2 - 2-Player CD-ROM Starter Set $176.60