Feel free to look and see if you can figure out which cards those are
Creature - Wurm Creature (CTRL to add secondary) Draw Grothama, All-Devouring Other creatures have "Whenever this creature attacks, you may have it fight Grothama, All-Devouring." When Grothama leaves the battlefield, each player draws cards equal to the amount of damage dealt to Grothama this turn by sources they controlled
Boxes included, or you can buy the House and Boxes separately
That initial suspend cost isn't cheap, but you'll be getting an extra draw on your upkeep and every time you're able to remove one with one of these funky new Doctor Who cards
This card is probably a pipe dream, but I really hope that someone finds a way to make it work
One is themed around Earthbending, another around Avatar Aang and another around Lessons