Kark-Clan Ironworks is up about a ticket on Magic Online, which should translate to a couple of bucks in paper
While i take your point about sideboard specific cards i would class the blasts and disenchant very differently - one is a occasion maindeck card with very wide sideboarding potential while the other is very obviously a sideboard only colour hoser
This includes Nowhere to Run's own triggered ability
In cube life totals are more generally relevant (as in most matchups do make two life a cost, even if small) while in constructed there are far more matchups where it simply doesn't matter at all
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Toss in Lonis, Cryptozoologist, Prosperous Innkeeper, and Gilded Goose, backed by Collected Company, and you basically have a deck