Urza, Lord High Artificer As annoying to play against in the 99 as it is from an opponents command zone, Urza, Lord High Artificer is the most popular mono-blue commander for a reason
Runaway Steam-Kin isnt a Goblin, but I think it would be irresponsible to leave it out of considerations because the card is so powerful and has some specific fantastic uses with Goblins that Ill get into later
This isnt a bad thing, but its worth noting that red is a ways away from having the critical mass of playable staples that blue, black, or green can boast
With most cards, much of the concept and design of the creatures are already established and its the job of the artist to take those tools and use them to create a tight, punchy package wrapped up into one final image
Elementalist is the avatar for you