Thran Power Suit Soon youll be able to build an Aura/Equipment deck using only the options that buff creatures for every other Aura or Equipment, a la All That Glitters
1/4 Illustrated by Campbell White Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
Almost entirely because of duplicate protection, they have now 100% lured me in as a customer to start seriously playing on MTG Arena and spending money, while also still collecting Common, Uncommon, Rare sets on MTGO (though no longer Mythics, it's too expensive to keep that up)
Other reach cards are also versatile and see play in everything from Standard to Modern
For example, if an effect allows you to cast a sorcery spell with mana value 2 or less from among cards in your graveyard, you could cast Assault this way, but not Battery