If you want to commit even harder to the wraith typal theme, changelings are a great place to start with Black Market Connections, Changeling Outcast, and Maskwood Nexus
However, a few things have changed over the last several years that have led to Paradigm Shift actually seeing play in every format its legal in the printing of two very good cards that have alternate win conditions tied to you shrinking your library or erasing it entirely
Cartamundi seems to set up shop exclusively in temperate areas that fall within this sweet spot of humidity
Card number: 078/162 Rarity: Cosmos Holo Rare (deck/booster exclusive) Raw price (ungraded): $0.20 PSA 10 price: $50 Release date: 2024 Trick or Trade / Temporal Forces
Mirrored Depths Plane: Karsus Whenever a player casts a spell, that player flips a coin
Wizards of the Coast gives them a fair bit of love, too, as several relentless cards have appeared as bonus cards before