When you start sideboarding out those enchantments, the following cards become weaker: Eidolon of Blossoms Kruphix's Insight Herald of the Pantheon Starfield of Nyx Sigil of the Empty Throne Rather than play "good" cards like Elspeth and Wingmate Roc, we have Sigil of the Empty Throne, Boon Satyr, and Suspension Fields because they happen to be enchantments
The five-headed dragon slotted right into a number of builds within the Commander format
Right off the bat, the card does what Dreadbore does, at minimum
You may play the card exiled with Compleated Conjurer even if Compleated Conjurer leaves the battlefield or you lose control of it
Battlesphere is played as a top end threat in some control decks, it is a mainstay in artifact ramp decks and it shows up fairly often in combo decks as well
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