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Goblins are very skilled at games of chance. It's one of the reasons they and leprechauns don't get along. The last thing a leprechaun who's running a casino wants to see... is a goblin walking through the front door. Goblins also run casinos and gambling dens in the CN:H world, they just don't allow goblin patrons in.
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Goblin magic is not tied to luck, but wealth. They're attracted to wealth in all forms, and they have an affinity for making it. They are, usually, fairly morally flexible about how they go about making their money. (Greer has, according to most other goblins, fallen in with a bad crowd. He'll never get rich by following all those pesky rules.)
So if Greer and Jack were dicing for pebbles, or ice chips, it'd be up to luck, but since somehow Greer has managed to convince Jack into gambling for coin, his innate magic comes into play.