To make the most of casualty, you'll want to fill your deck with creatures that reward you when they die, like Sinister Concierge, or tokens you have no attachment to, like decayed Zombie tokens
Lifegain payoffs seem to be settling firmly into Bant with many Azorious payoffs recently like Will from Wilds of Eldraine
Need to make sure the balance of acid to salt is correct and that the meat's had sufficient time to brine
Because of Painter, every card in target players deck now shares the same color, even the lands
Hes always ready to defend his companions, charging into the fray with his trusty miniature giant space hamster, Boo
Its a pretty nice way to help with progression because sometimes playing with starter decks feels extremely limiting