Back in Commander 2018 , we saw the reprint of Budoka Gardener, showcasing that the updated templating for flip cards involves moving the set symbol (also super confusing)
19 | Draw two cards
Since Persistent Petitioners is a Human, and you can use them to mill yourself, the strategy is simply to throw a bunch of Persistent Petitioners into the deck alongside a bunch of copies of Slime Against Humanity, mill yourself out, and then play more Persistent Petitioners to cast those copies of Slime Against Humanity from the graveyard
a small amount of lifegain is but a drop in the ocean, particularly in a format where players start at 40 life
Borderless Main Set These are cards present in the main set that features the same art, although with an extended borderless style
That lets you swarm over the battlefield faster than ever before since every Hare Apparent gives you twice as many tokens