In the early days of Hearthstone, I used to get frustrated at the number of Legendary cards that a character had in their deck. I felt like their legendary card ended up being too much for me to handle. I would get annoyed at the lack of legendary cards that I would pull when I unlocked a new deck. I wasn't about to go blow money on Hearthstone because I truly don't care that much. Now over a year later, I have accumulated quite a handful of legendary cards and created a deck with my druid that employs every legendary card that I have. Since most legendary cards have higher mana costs, I spent the rest of my deck on cards that would help me accumulate mana crystals fast. While my deck is fun to play, it doesn't help me move through the ranking system very well. In fact it usually sends me backwards. But who cares!
Tinkmaster Over spark only costs 3 mana and at random changes a minion into a 5/5 Devilsaur or a 1/1 Squirrel. This is not a bad card to throw out if your side is empty or filled with low-level minions while the opponent has some hefty or cavalry. You have the opportunity to turn your trash into treasure or possible their treasure into trash. However, if you don't like the uncertainty of tossing a gnome on the board, you can follow up with Hemet Nesingwary. Did Tinkmaster just turn your opponent's Novice Engineer into a 5/5 Devilsaur? No problem. Let Hemet blast that dino in the face. Do I think keeping these clowns in your deck is a good idea? Not really. I don't like the uncertainty of Gnomes and I think 6 mana is a bit rich for a guy that only has 3 health and be eliminated with any number of cheap spells. It is fun to let an opponent thing you goofed and gave them a Devilsaur only to have it blasted away on your very next card.