­Swamp Strider + Gorgon's Head + Box of Free-Range Goblins

Ooops, accidentally rolled gatherer twice. Well; sure and I'm not letting that last one get away!

So, we have a creature that turns into a swampwalk aura. And medus's head-on-a-shield (sheesh, I mean, top down sure, but blatant much?) annnd... 1-6 goblins. In a box.

The first two are very very black. And goblins are permitted to be black. Those tend to be a bit bigger (which doesn't mean huge) and.. not really have much of a mechanical identity beyond that that I can see. Huh.

Well, the first two are plainly some kind of creature improvement; and then we go into un-land. So we're making an augment!

Augments are the triggers. "Whenever a box of deathtouch walks into a swamp". Flavourful, but mechanically somewhat difficult.

"Whenever tokens ETB" would work, but would be kinda really crappy, as a rare event compared to the others.

Could go more deathtouchy; "Whenevr a creature dies". Hmm, Monkey-] exists. Ok, whenever an opponents cretaure dies.

The strider is +1/+1 and goblins tend to be. So that's the size. I could fit deathtouch and swampwalk on... Sure, why not. Augments are WORSE than auras; so we need to fit on quite a bit of gooodstuff to be actually good.

And those two abilities give you a nice tension - good evasion so attack; but also good at killing things which triggers its other ability (whatever that turns out to be)

Feels like cost should be... about 3? Certainly not common; doens't feel rare. Mock augment in the reminder text, and done.

Seems about right. Swampwalk is unfortunate - and actually quite inelegant paired with deathtouch, especially here.

As a designer you want to maximize the time someone spends sweating over whether to block that Gorgo, but now anyone controlling a Swamp doesn't get to choose. :(

Mildly deliberate tension in this case; but I can certainly see it being more interesting without it.