This seems like a nobrainer…“The Grin Reaper”.
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“Shits and Grins” 
“Just for grins”
I usually call mine “the Griner”, sometimes a typo occurs and it becomes “the Grinner”. I like them both.
from http://harrypotter.wikia.com/wiki/Niffler
A Niffler was a creature with a long snout and a coat of black, fluffy fur.[1] They were attracted to shiny things, which made them wonderful for locating treasure […] Nifflers are assigned to Curse-Breakers by the Gringotts Head Goblin to burrow underground in search of treasures hidden in cursed sites.
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Woody Powpecker ? 
not very good with vector art, but here’s the idea
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Kind of makes sense too because with cut-through old tx are cut out, and that’s actually one of the main things miners do when they validate tx and create new blocks, so the scythe is very pertinent 