Since Bolass Citadel lets its owner play cards from the top of their library by using their life total instead of investing mana
A great sideboard card to have
Best Wilds of Eldraine cards MTG Rowan, Scion of War Farsight Ritual Stroke of Midnight Decadent Dragon Asinine Antics Virtue of Knowledge Eriette of the Charmed Apple Scalding Viper Questing Druid Realm-Scorcher Hellkite Despite this not being an official Universes Beyond set, there are still plenty of nods to things like Grimms' Fairy Tales that make it feel a bit like a crossover
The mix of old and new, the references and in-jokes, and the balance of genuinely exciting new cards with Draft fodder could well mean this is one of the greatest MTG sets in the last few years
Damaging yourself is debatably a downside, but you are rewarded by a massive 4/4 Lifelinker once you drop under half life with this effect
Generally, this issue raises up by having either a plus or a minus thats way better for their cost than other options, so the choice will always be to activate that one ability as much as possible or get to it as much as possible