I have used Abrupt Decay and Assassins Trophy on and off over the years, often leaning on Assassins Trophy over Abrupt Decay because of its ability to hit Dark Depths , Griselbrand , Elesh Norn Grand Xenobite , Jace, the Mind Sculptor , Tabernacle of Pendrell Vale , etc
Take a look at Coastal Piracy too, although I think due to Pirates being back in Magic it's had a bit of a price spike
Overall, the mechanics within the set are a lot of fun
I especially like the versatility of the graveyard mode, since it can snipe a card from an opponents graveyard but also do a good Noxious Revival impression
If two or more opponents are tied for the most life among your opponents, you may have Galactus attack any of those opponents
Lets take a look at the Top 10 Worst Magic Card Errors, and all the while well remind ourselves that everyone involved in these oopsies are human