While there are other strong options like Krenko, Mob Boss for generating tokens or Chandra, Torch of Defiance for card advantage, the Fuseling's ability to grow larger with each oil counter can create a formidable threat in the right build
My opponent's never hit their mana dork when they start revealing cards, it's always the fatty creature that was never supposed to have haste to help balance it out
Attack, die, rebuild, and outlast is your approach, bringing back the living machines over and over to out-grind your opponent
The second is that this only works on the first one cast, so they can cast Brainstorm to dig for something and then cast what they drew
The covetous Lobelia Sackville-Baggins shows up with the set of partially-pilfered spoons Bilbo bequeathed her when he left Bag End
Making creature tokens isn't a bad effect, but the mana generation provided by treasure is much better for chaining together spells