Most of them came back around an 8 or 9, at least with the Certified Guaranty Company (CGC)
Then you can untap Nykthos to make a ton of mana infinitely, or untap beaters for blocking outta nowhere or untapping dorks and artifacts with tap abilities to Loot like we'll see below or that above Key to the City which taps with a discard so you can keep it up and then you can draw with its cards too or just get more than one unblockable thing, love this loads
But they arent key to the card, and even the art is whimsical, but printable in a black bordered set
I think this pairs best with partner commanders that either add card advantage (Tymna the Weaver) or access to colors with ramp (Jeska, Thrice Reborn or Reyhan, Last of the Abzan)
Id also definitely endorse staying on type with Krenko, Tin Street Kingpin, as youll quickly have more Goblins than you know what to do with