Reveillark | Body Double | Phyrexian Altar

Cards

Reveillark in your graveyard.
Body Double and
Phyrexian Altar on the battlefield (
Body Double as a copy of
Reveillark).

Activate
Phyrexian Altar by sacrificing
Body Double, adding one mana of any color.
When
Body Double leaves the battlefield, it triggers its
Reveillark ability, returning itself from your graveyard to the battlefield as a copy of
Reveillark.
Repeat.