Cards like Thunderblust that have high power and low toughness become much more difficult to kill in combat with Zilortha in play
You get to exile instants from your graveyard with a kick counter, which means theyre available for Chun-Li for the rest of the game, even if Chun-Li gets sent back to the command zone several times
Its wild that White Plume Adventurer and Seasoned Dungeoneer have been making waves in the Legacy format lately, making them a bit pricey to pick these up these days, but there are certainly some other, cheaper options available
Druidic Ritual and Sudden Reclamation for a creature and a land, Eccentric Farmer/Pothole Mole as creatures with the same effect, Roots of Wisdom for elf typal decks, Crop Sigil as a self-mill engine, and Say Its Name if you want to cheat Altanak, the Thrice-Called from your library
The effect is optional, just be careful as it may accidentally mill a useful non-Rat card that'll be near-impossible to get back