Its worth noting that both Quicksilver Amulet does this without the Creature type restriction, and Dragon Arch does it for cheaper, but only for multicolored Creatures
It can occasionally backfire, as the opponent will be able to put the top card of their library onto the battlefield if it is a permanent
Foretell captures that perfectly: set it aside early, build your forces, and when the moment finally arrives unleash devastation
From PuPu UFO, Goobbue Gardener and Torgal, A Fine Hound through to Ignis Scientia, Prishes Wanderings, Summon: Fenrir and Blitzball, I cant remember another format with so many ways to ramp at two and three mana
Permanent types can be combined, most notably in the form of artifact creatures (representing inorganic creatures and mechanical constructs) and enchantment creatures (representing inherently-magical creatures and spirits)