Given how easy it was to acquire, there are likely quite a few copies of the card in the game, although there are two things that help to contribute to its rarity
The deck also features a number of card draw spells to help you draw for your deck to find the planeswalkers (some effects even allow you to tutor for specific planeswalkers), and acceleration spells to help you quickly summon your planeswalkers
Its probably best known for its cheesy infinite combo potential with Sage of Hours
Yellow Gadget SDMM-EN017 Common 1st Edition Red Gadget SDMM-EN016 Common 1st Edition Green Gadget YSYR-EN019 Common 1st Edition Adding Machina to the equation provides a definitive method to conclude duels and transform the card advantage gained from Gadgets into more formidable monsters
one user instead likes 68 lbs Cover paper if they plan on laminating and sleeving their cards
you get a 3 mana bolt that you can then escape later, if you're casting it from your hand, and then when it hits the battlefield it certainly is quite a problem