Aerith, Last Ancient Lifegain decks are always on the hunt for payoffs that make gaining life worthwhile since doing so doesnt impact the board
Most madness cards get a highly reduced cost when played for madness, so as long as you have a somewhat decent mana base on the field, you can draw a ton of cards while also playing everything you discard
Genia of the Ring would fit best in Spellcaster-focused combo or midrange decks that frequently Tribute or banish Spellcasters for costsuch as Endymion, Mythical Beast, or certain Spellbook variantsbecause it can Special Summon itself from hand for immediate field presence, convert key monsters into Spellcasters for archetype synergy, and recycle itself when used as cost for a Spellcasters effect
This builds on white rigidity you can have strong effects, but they are reliant
All That Glitters is a great example as its both an aura itself and a great payoff for playing a lot of them
Remove Soul is Remove Soul