Spending a total of 4 mana just to shuffle your graveyard is criminally over-costed, but 2 mana for a repeatable source of self-mill that can salvage a key card you didnt want in the graveyard or shuffle your spells away pre-Rest in Peace has merit
Then try this four-color deck with Yidris at the helm and Keruga in the companion zone
Ratcatcher is another useful addition to rat decks, letting you tutor for whichever rat you need most
As my art director said, Cynthia [Sheppard], it doesnt make any sense to make a race of Cinderellas
Tymna the Weaver & Ghost of Ramirez DePietro - DePietro's evasion ability gives you a greater ability to hit your opponents, which will give you more card draw with Tymna
Providing repeatable card draw for three mana, with a ceiling of four cards in one circuit of the table, The Gaffer is among your best options