Ziggy The Zagger

Partner with Toxii, the Remover of Death (When this permanent enters, target player may search their library for a card named Toxii, the Remover of Death, reveal it, put it into their hand, then shuffle.)
When Ziggy The Zagger enters the battlefield, Pain target creature. (Target creature gets -0/-1 this turn, and then the next turn, and repeat until 4 turns have passed. The targeted creature does not heal during the heal step during this process)