If I have an Ancient Den plus an instant and a sorcery in my graveyard, I have delirium but not threshold
Whereas, cards like Hades - Lord of the Underworld, Snow White - Well Wisher, Lady Tremaine - Wicked Stepmother, Nick Wilde - Wily Fox, or even Mufasa - Betrayed Leader I would consider passive card draw engines, but serve different purposes when used correctly
Cards like Diregraf Ghoul and Leonin Vanguard arent getting the job done without some serious help, but Carnage Tyrant, Regisaur Alpha, and the absurdly silly Gigantosaurus can do most of the heavy lifting themselves
Rapunzel - Sunshine is one of the key characters in this Lorcana format
Cards like Doomwake Giant offer a strong incentive to keep casting enchantments as youll get a powerful sweeper effect, and good constellation cards from the Theros era are also present
Instead, tap it, remove all damage from it, and remove it from combat