There are a lot of gnome minions in Hearthstone, 51 as of Frozen Throne. In the 6 expansions that have released some patterns have emerged. Gnomes primarily put cards in your hand, either directly like the Gnomish Inventor, or indirectly like Wilford Fizzlebang.
This seems to be the niche gnomes fill in Hearthstone as a whole. I’m kinda sad that Northshire Cleric is not a gnome card since it is probably the most common Draw card used. 13 of the 51 Gnomes in the game put or, facilitate putting, cards in your hand. In fact the “Spare Parts” mechanic added in the Goblins vs Gnomes expansion is NOT found on any of the goblin cards in that set. This reinforces the gnome roll in gaining cards. I am most impressed with new Gnomeferatu card, which basically has you draw a card from your opponent’s deck and then discard it. It’s exactly what you would expect from a gnome parasite.