Being able to Regenerate any time, at instant speed, for no mana, means your opponents will never be able to deal with the enchanted creature via traditional means
Pernicious Deed (2006) This 2006 promo of Pernicious Deed has the old DCI logo, a remnant of a now mostly gone system
If a noncreature artifact is returned to the battlefield this way and another effect would cause that artifact to be a creature while it is on the battlefield (such as the ability of March of the Machines), that artifact will enter the battlefield with an additional +1/+1 counter
As a baseline example of how messy this can get, imagine playing Dark Depths and sacrificing it to, say, Crop Rotation
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That's Waylay in a nutshell: nerfed but still gigging Viashino Sandstalker since 1997, but not the best when you're stuck at one mana