The big jump Ethan made in the design was the idea of making it a monocolored creature in its mana cost and then having a five-color activation, which would allow it to have a five-color identity and thus work as a five-color commander
Irencrag Pyromancer deals direct damage, either to your opponent or to their creatures
Arrogant Wurm, Reckless Wurm Arrogant Wurm was a powerful card in the Madness deck as a fast 4/4 trampler for 3 mana that was otherwise free
Dominus of Fealty takes control of any permanent for one turn at the beginning of your upkeep, Reins of Power switches control of creatures with an opponent, and Insurrection gives you control of literally every creature and untaps them with haste to get them ready to beat one unlucky soul into the ground
To be clear, though, the two are very different cards and the main (only) resemblance is the mana cost and power and toughness, but even still Im a believer in Walking Ballista
Dimir Control (16 players): Dimir Control makes the most of the new set, exploiting card advantage from The One Ring and Sauron's Ransom along with free interaction like Force of Negation and Subtlety to take control