Cavalier of Night | Mirror Image | Ashnod's Altar

Cards

All permanents on the battlefield (
Mirror Image as a copy of
Cavalier of Night).

Activate
Ashnod's Altar by sacrificing
Mirror Image, adding ({C} magic symbol) ({C} magic symbol) .
When
Mirror Image dies, its last ability from
Cavalier of Night triggers, returning itself from your graveyard to the battlefield as a copy of
Cavalier of Night.
When
Mirror Image enters the battlefield, its first triggered ability from
Cavalier of Night triggers; choose not to sacrifice a creature.
Repeat.