First, while a double-faced permanent is on the battlefield with its back face up, its mana value is calculated using the mana cost of its front face
The Dragon will often be able to hit your opponent at least once, even if they have removal, and any more than that and youre talking about a massive gap in life totals in your favor
They all do the same thing, and are functionally the same card, but that hardly matters - Final Fantasy and Magic mega fans are going to want to have them all to display in a pretty binder
Dust appears to be lifting off from the planet to be collected by the dark cloud, forming an air of mystery as to what, if anything, on this image is truly alive
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That efficiency is exactly why it remains one of the best black cards in MTG