You could easily add this card in any Rakdos deck since it essentially only needs itself to work well enough, but it also fits wonderfully in decks like Anje Falkenrath madness or any other mechanic that technically plays things from exile
Complex card searching and suboptimal deck building is an important part of the format, and legalizing an overprinted expansion is not really in the spirit of this
We want unique things, things not everyone has
sacrificing creatures is among the best things you can do in the game, and +1/+1 counters are a fine payoff
Nearly all competitive decks with two or more colors include fetchlands thanks to their powerful color-fixing, deck-thinning and shuffle effects
This is because Cloud is themed entirely around equipment cards, especially his ability to attach one equipment to him for free when he enters the battlefield