HEDGE-MAGE?!
First of all, to reply, Snakeform seems cute for sure and possibly good. I've used it at 3cmc and it felt like it got stuck in my hand a lot but it's a lot better at 2.
I want to start by saying that I actually really like the concept of these guys, I just think that the majority of the scenarios they create are negative experiences. I would LOVE for you to convince me otherwise and that these are all fine, because they ARE interesting designs.
1. We have 2 plains turn 2 and we get a decent 3/3 overall stats. Nice, but easily achieved more consistently.
2. We have 2 plains turn 2 vs an aggro deck and we trade the 1/1 for their t1 and the 2/2 for their t2 and the game is effectively over.
3. We have 2 swamps turn 2 and we shrink their dude a bit or pop a token. Ok, I guess.
4. We have 2 swamps turn 2 and we kill their 2/1 and block their t2 play and the game is effectively over.
5. We've drawn a nonbasic land and we maindecked a 2/2 for 2 with no effect. Bad and probably very common. I don't foresee a shock/fetch manabase here.
6. We've drawn this later in the game where it will chump block twice, maybe the -1/-1 matters.
1. We have 2 islands and tap some blockers. Alright, I kind of like that.
2. We have 2 mountains and this is baby Flametongue Kavu, an insanely busted card. Much less relevant later in the game, but a serious t2 tempo.
3. We've drawn a nonbasic land and we maindecked a 2/2 for 2 with no effect.
4. We've drawn this later in the game where it could open a path on a very even board.
1. We have 2 swamps and this does a very mild and appropriate +1. I do worry that a density of this effect is unfun, however. Curving out ETB discard would hurt.
2. We have 2 forests and no targets to put on top.
3. We've drawn a nonbasic land and we maindecked a 2/2 for 2 with no effect.
4. We've drawn this later in the game and it's still an ok +1 and/or a +0 recur on a 2/2.
1. We have 2 plains and we Time Walk their turn 2.
2. We have 2 plains and they have no targets.
3. We have 2 mountains and we Time Walk their turn 2.
4. We have 2 mountains and they have no targets.
5. We've drawn a nonbasic land and we maindecked a 2/2 for 2 with no effect.
6. We've drawn this later in the game and hit two targets and get them pretty bad.
1. We have 2 forests and gain a little life. Sometimes relevant.
2. We have 2 islands and we bounce their guy, setting them back a varying amount.
3. We have 2 islands and they have no targets.
4. We've drawn a nonbasic land and we maindecked a 2/2 for 2 with no effect.
5. We've drawn this later in the game and we bounce their guy, setting them back a varying amount.
6. We've drawn this later in the game and they have no targets.
Sorry that this was so long, but I wanted to get my take on all the outcomes in here. This is how I analyze most cards, especially ETBs. What's the most unfun case from both sides of the card? If your Duergar hits my turn 2 artifact creature, you end up really far ahead on board immediately. Conversely, when you lack the proper lands to hit these in a timely manner, you're frustrated that you took the card. It's a REALLY high variance scenario. Granted, they aren't all that bad, but the "miss" case feels pretty shit.