It works well with cards like Jace's Phantasm, lhurgoyfs, and anything else that grows as cards flood the graveyard
Not only will it give a good buffer but it gives you more options in how you play, throw it down early and just fight the tempo directly or bait them into over extending by holding back the Finks
Sure, maybe Affinity decks dont need any help putting more copies of cards like [casthaven]Arcbound Ravager[/casthaven] and [casthaven]Etched Champion[/casthaven] into play, but maybe theres another artifact combo deck waiting to be born from Copy Artifact
As such, it doesnt matter whether or not your creature has flying if you want to target an opponents Planeswalker
It also means that long-term casual specs tend to rebound faster than comparable cards from normal expansions
They are legal in whatever formats the cards are already legal in