Field of Ruin An excellent main deck answer for creature lands and the Castle cycle, every mono- or 2-colored deck should run one or two Field of Ruins
Magic Modern Horizons 3 card list & price guide
The Sheldon Menery Secret Lair is dispatching at the moment, and while reflecting on all of what Sheldon did for the community, Ive been musing on one of his favorite phrases lately: You did this to yourself. Decks that play opponents cards are super popular, from Gonti, Canny Acquisitor to Oops, all Clones!
Norns Choirmaster gives you a new way to proliferate your opponents poison counters up by proliferating whenever your commander enters the battlefield or attacks
Neither of these records are going to be easy to beat (with a shorter probably being impossible)
Wastes is the best flavor fit for Eldrazi decks, however, and is therefore more of a direct tie to the type than those other examples