Once the ability resolves, the bonus applied by that instance of the ability doesn't change even if the number of permanent cards in your graveyard changes
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Rest in Peace, Deathrite Shaman, Abrupt Decay, Ethereal Armor, Chromatic Lantern: all cards with significance in eternal formats, all cards that debuted right here in Return to Ravnica
For a taste of just how much you can mess around with evoke triggers, check out Jesse Barker Plotkin's piece on getting the most out of cards like the Maw, Grief, and Fury with Undying EvilUndying Evil and its ilk
Having zero creature types doesn't do Nameless Race much good in the game, but it's still an intriguing idea