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Orim's Chant is the Legacy equivalent of Silence

Well, you'll either need to collect the cards from Arena booster packs for the sets they came in, or else directly 'craft' the specific cards you need using MTG Arena Wildcards - effectively tokens you can exchange for the exact Common, Uncommon, Rare, or Mythic Rare card you want, depending on the type of Wildcard

Another common argument is the toolbox argument

Many decks will struggle to play out of the counter effect from flipping Erayo into an enchantment, and fewer still will have enough cheap disenchants available early to punch through if the worst happens