I suspect that even the worst x cards in your top ten may be better than were anticipating on paper, especially if your deck is land-rich
Youre probably playing Lightning Greaves and Swords to Plowshares already, so add Crackdown Construct and you can gain life equal to the largest library and win on the spot
It requires creatures to be both attacking and blocking to maximize
For three mana you get a never-ending engine of returnable creatures or lifeloss, both of which are just fine in a game
In a deeply interactive format playing only sorcery speed is annoying, and it also stops a ton of cards such as Cascade spells, Shelldock Island, Instant Madness cards and Bring to Light
The demand for specific cards like Palantir of Orthanc and Sauron, the Dark Lord, drives their prices up in the secondary market