While it has hexproof from artifacts, creatures, and enchantments, one of the most notable features of Nevinyrral is that, upon entering the battlefield, it creates a 2/2 zombie token for each creature that had died that turn
Rootcast Apprenticeship and Verdant Command can each give you tokens, but also a ton of other modal utility
Much like Spree cards, this means that Tiered spells have extra utility when compared to a standard instant or sorcery
Improvements + Cards To Drop The easiest upgrade is adding three more Emily Quackfaster Level-Headed Librarian
Other cards that will likely be key to such a strategy include Helping Hand, Thought-Stalker Warlock, and Treacherous Greed
The idea was that you would play it in a deck with both colors, but if you don't draw one of them, you can cycle the card away