Its not that it was a bad start it just had a tough act to follow after the many insanely great sets released in the Sword and Shield era
Many Artifacts are also Creatures and the vast majority of them are colourless
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10 Mindless Null The Zendikar block, like many others, has a tribal subtheme
Speculating on a leak, however, carries double the risk in the sense that as a speculator, youre betting on the probability that the leak is a legitimate card, and then conditioned on that, youre betting on the probability that said card will also be useful or in-demand