In no particular order, these were my picks
(2/2/2024) If the second triggered ability is countered, the card can't be cast
Triggering Bloodthirst One of the great things about this mechanic is that if you can get one Bloodthirst creature triggered, you now have a very aggressive creature you can send into the red zone to force chump blocks or trigger your next Bloodthirst creature
Explore the worlds and mechanics that made Wizards of the Coast famous, with sets like March of the Machine, Phyrexia: All Will Be One, Dominaria Remastered, and many more
Avatar: The Last Airbender Ascensions The four elements trigger for quest counters in different and thematically matched ways, and because they take a bit of work, are very aggressively costed