Vastwood Surge has synergy in +1/+1 counter decks, for example, and Circuitous Route is a staple of gates decks
Some cards from this set as well as some from the previous 3 sets will get altered-border versions with higher than 204 numbering
Still, the correct maneuver is usually to deploy the giant, implacable death lizard
Krenko, Baron of Tin Street The aspiring goblin player has several choices for commanders
To be honest, I was trying to avoid being too specific about what I think you should do and was just responding to your own idea about adding more removal, but now that I've taken a more serious look at your deck, I do have a lot of very specific advice, if you're interested in that, and Longstalk will definitely be a more effective choice if you do decide to follow my recommendations
Zulaport Cutthroat helps pull some extra value out of your creatures' demise, and Contagion Clasp is proliferate on a stick which helps your -1/-1 plague spread even further