Those are the two categories that should really be avoided for a bonus sheet to have an overall positive impact on a format
Iconic cards are even rarer than Enchanted
The breakdown for each booster pack is as follows: 2 Non-foil showcase Scrolls of Middle-earth commons 2 Silver foil show Scrolls of Middle-earth commons 2 Non-foil showcase Scrolls of Middle-earth uncommons 2 Silver foil showcase Scrolls of Middle-earth uncommons 1 Non-foil showcase Scrolls of Middle-earth rare or mythic rare 1 Silver foil showcase Scrolls of Middle-earth rare or mythic rare 1 Surge foil full-art Middle-earth map land 1 Non-foil borderless Scene Box rare or mythic rare, or 1 extended-art rare Jumpstart card 1 Surge foil extended-art rare or mythic rare 1 Surge foil Booster Fun card, or a surge foil or serialized Realms and Relics card 1 Silver foil or non-foil Brothers Hildebrandt card, 1 traditional foil or non-foil borderless poster card, or 1 serialized borderless poster card 1 Double-faced surge foil token Do LotR Special Edition Collector Boosters Contain New Cards or Reprints

The common (Pauper, Peasant, Pauper Commander) costs four for a sorcery that draws you cards equal to the creature type you choose when you cast it
Even though The First Chapter featured some Floodborn cards - like Tinker Bell, Giant Fairy - Rise of the Floodborn will contain even more, alongside other types of Disney Lorcana cards
I couldnt teach someone how to play Lorcana better than Gateway does, which is something I couldnt say about any other game Ive taught.