While you can fire off Hymn of the Faller to just draw one card in a pinch, you probably should hold off for as long as possible and hope to trade something off and get an extra card for your troubles
You mostly end up cycling it, but once you have multiple Wilderness Reclamations online, using it to draw two cards is a great way to keep the wheels spinning as you draw through your entire deck
Illuminor Szeras Its possible to make some silly amounts of black mana with Illuminor Szeras, but you only ever get back the same amount of mana you put in unless you make your creatures cost less
The most expensive White Flare cards are the Red Victini Black & White Rare, Reshiram ex SIR, and Hydreigon ex SIR
Since she can also use this on herself, that makes her a top-tier protection resource in virtually any deck that dips blue and/or green
Id like to extend a big thank you to Lorcana Decks on X/Twitter for aiding in my decklist research and DreamBorn for their super easy to use deckbuilding tool