It caps out at three cards (proliferate, anyone?), but it also leaves you up a Treasure, a 1/1 token, and a 4/4 vehicle after the bank heist is over
If you attack white or block white, your creature has gotten itself involved in the fight and thus it's okay for white to destroy it
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
Not because it is powerful, but because it shuts everything down
Adds: Cuts: Kumena $50 Upgrades We're adding generic Merfolk upgrades, the best untappers (Intruder Alarm), and more tap payoffs (Inga and Esika)