Those poor guys
The creature card you return, if any, isn't a target of Black Sun's Twilight
You can stick with Edgar Markov and build an aggressive Vampire deck by adding more lords, Shared Animosity, and other aggressive tribal-matters cards, or you can go with Licia, Sanguine Tribune and build lifegain combo with Sanguine Bond, Exquisite Blood, Defiant Bloodlord, and the like
Finally, the deck features a handful of powerful removal spells and wrath effects, spells that can directly turn vehicles into artifact creatures (avoiding crew costs), spells that can protect your vehicles, as well as powerful card-draw engines such as Whirlwind of Thought and repeated token generators such as Outlaw's Merriment, Efficient Construction, Saheeli, and more
For most Cubes though, I love Walking Ballista as a solid card that can go in any deck that offers relevant support to artifact decks and stuff like delirium
It's very strong and beloved and became the default Simic Landfall for many players and have never left it