@desolutionist Not clear what you want to counter, but Burning-Tree Shaman, Harsh Mentor and Immolation Shaman do something similar to Haunting Wind.
Why do the Eldrazi decks play Mutavault over Mishra's Factory? I can't seem to find the upside other than dodging artifact hate.
I'd love to see a Careful Study deck with these where you can chain them. Probably too cute, but should open a few doors to try.
A lot of things counter a Tendril kill better than this already, while having other utility.
I was curious about the creature type Carrier, and turns out this is a nod to the Urza's Legacy cycle of creatures that give -X-X. They even used the same reference in the flavor text. I love when they add little details like this 
I'm really enjoying this set so far which is full of "What would a Vintage staple look like if we didn't mess up the design the first time."
This is the best example. Costing 2 and having an activated ability of 1 is strong, but reasonable. And Welder, nor the color pie or abilities in general, are meant to just permit exchanges in the opponent's graveyard.
That said, I would have never thought of adding a built-in Entomb, and I think it's great flavor!
@blindtherapy It's also a bit more restrictive in the case of a topdeck situation where you don't already have the extra card to pitch, meaning you can't remove the threats right away and then attack or cast more stuff. If you don't have a big density of green cards, this should come up quite often.
@nba84 People love nostalgia, inside jokes and references. Time Spiral was full of them and a big hit as I recall.