It asks for minimum effort for maximal output, and its usually safer in the bin than a permanent on the battlefield would be
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And, of course, the game's popularity can affect the value of cards
Conjurers Mantle Conjurer's Mantle is a simple Short Sword-like equipment, but in typal decks, youll almost always draw a creature when attacking with this equipped to something
These range from popular Commander cards (Cathars Crusade at 128k decks on EDHREC) to Modern archetypes (Through the Breach) and even Griselbrand, who gets reanimated now and then
Not too shabby, but that's a lot of breaks - it's legendary, needs to be attacking, but it will work on stuff like Syr Konrad and such