Fluros cares about particular numbers appearing anywhere on a card, while Hardy cares about the number of lines in flavor text
Persistent Constrictor Persistent Constrictor just loves the -1/-1 counter play in Lorwyn Eclipsed and sneaks in some spectacle enabling or any effect that cards about opponent's losing a bit of life each turn
I hope you feel confident about accessing your sideboard
Depending on context, these cards may be called prison pieces, hate cards/hatebears, sideboard cards, or, in some circles, stax cards after the ancient Smokestack-based deck which popularized not letting the other person play as a strategic archetype
Unfortunately, the card has made its way onto the banlist for Legacy and Modern, the most accessible 60 card formats with those lands, and without them, Deathrite Shaman is a lot less funky