Very fun/interesting idea on Aether Tether. Wouldn't be overpowered at all but would see immediate play in stax decks. I'm totally ripping off the idea to make a creature with the same ability:
I like the idea of pushing the artifact connection. What about a rare artifact creature:

Heavy Metal Golem
Artifact Creature - Golem
Heavy Metal Golem comes into play with X weight counters on it.
Heavy Metal Golem gets +1/+1 for each weight counter on it.
At the beginning of your upkeep, you may move any number of weight counters from Heavy Metal Golem to any number of target permanents.
If Heavy Metal Golem is anywhere, permanents with weight counters on them lose flying, cannot block creatures with flying, and cannot be returned to their owners hand.
0/1
Workshop players would be all over this, since not only is it a powerful, versatile answer to the biggest reason they lose, but like, 99.9% of workshop players are into heavy metal