Given that Goblins usually run in packs, youll often find yourself rapidly blasting past twenty Goblins with very little effort, so if you build your deck intelligently, you can flood the entire board in an instant, and nobody can stop you
The baseline of a 5 mana 4/4 trample is too inefficient and the madness cost is manageable with free outlets but makes it relatively difficult to use with things like Faithless Looting, Fauna Shaman or more expensive discard effects
Then as long as you have 30 or more life, the dork gets indestructible to remove much removal interaction, only exiling mass removal or targeted non-destruction removal can get past this, and then it's +5/+5 size and then all damage to it is prevented
After playing around with different sets, a pegasus focus seemed to be the most smooth for this deck
Graveyards in Commander are like a second hand