Year of the Rat is a Secret Lair drop, released January 2020, with 8 cards. Its cards are currently worth $134.28 combined, and the sealed drop sells for about $152.13 — a 0.88× value ratio.
5× Rat Colony (foil) — SLD #36 — $14.40
1× Marrow-Gnawer (foil) — SLD #34 — $37.57
1× Ink-Eyes, Servant of Oni (foil) — SLD #33 — $14.07