search for enchantment card mtg Standard cards to Library enchantments? : r/magicTCG then shuffle. Enlightened Tutor | Promotional |

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

For the Travis Woos out there, this does give Narset a Time Walk effect in Standard

Reverberate - Copy your Epiphany and get double the value by killing two pesky threats and getting twice as many cards in exile to choose from until your next turn

Creatures you begin to control later in the turn won't get +2/+1

It's not clear