The base rarity symbols run Common, Uncommon, Rare, Leader, Super Rare, Secret Rare, and Special, with premium variants (Alternative Art, Treasure Rare, Manga Rare) layered on top
110 is tails and 1120 is heads
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Does Machines Does Machines indeed does an excellent job of filling your graveyard for threshold and lessons, but to get the most of it, you should be playing artifacts
Also I have a problem with " these cards were very likely released as giveaway promotions on a smaller level after the release of Red and Green" you need to back statements up like this with real sources
If it were a bubble, we wouldnt be seeing so many people buying these cards for themselves it would just be investors buying and selling and buying again in an effort to keep searching out the greater fool