Agent 8

When Agent 8 enters the battlefield, exile the top 4cards of your library and put Thang counters on them. Whenever Agent 8 destroys a creature, take an exiled creature with a thang counter on it and place it face down under your control as a 0/0 Thang Token creature with indestructible .

{t}{b/r} Sacrifice 4 different Thang Token creatures to bring your second commander into play.

You may have a second commander if it is Commander Tartar, Blender.