Slumbering Cerberus

Creature — Dog4/2$0.17

This creature doesn't untap during your untap step. Morbid — At the beginning of each end step, if a creature died this turn, untap this creature.

Legal in Commander

Is

Commanders whose abilities work with this card and share its colors, from what the cards do.

Rin and Seri, InseparableSlumbering Cerberus is a Dog, which Rin and Seri, Inseparable can use.
Tesak, Judith's HellhoundSlumbering Cerberus is a Dog, which Tesak, Judith's Hellhound can use.