Typically indestructible are a little better against mass removal and the protection ones a little better against spot removal
You could honestly make a deathtouch deck with either of them at the front and the other as a support piece so that youre covered no matter what happens in combat
On top of that, killing the creatures in Dredge doesnt do almost anything because they just come back as easily as they went away
It takes a turn to get going which is always a problem, but if you can make it to your next turn, you're going to have two slivers to either protect you or pressure your opponent, and things will snowball from there
To get a token, players must purchase 8 packs of March of the Machine Set Booster. While this might not be the most insurmountable hurdle for avid MTG players, this detail, and the region exclusivity, has nevertheless made these cards expensive