The Hidden Fates expansion's "Jessie & James" lets players force their opponent to discard two cards from their hands while the user did the same
Graded Population Report: Leafeon GX #SV46 Visualize the distrbution of grades in the chart
Graded Population Report: Ultimecia, Time Sorceress [Foil] #247 Visualize the distrbution of grades in the chart
Shared Tutor Effects (Scheming Symmetry, Wishclaw Talisman) Tutors like Scheming Symmetry and Wishclaw Talisman are the first tutors to really explore the design space of tutoring for what you want, but allowing an opponent to do the same in exchange
For example, highlight your company name in a bold typeface, then support it with a tagline in a lighter weight
Win Conditions These are all cards that can simply win the game, the primary of which is obviously going to be Doomsday itself