Preston, the Vanisher | Phyrexian Altar | Sister Hospitaller

(and one other card)

({6} magic symbol) ({G} magic symbol) ({G} magic symbol) ({G} magic symbol) ({G} magic symbol) at most available.

Cast
Nature's Rhythm from your hand by paying ({6} magic symbol) ({G} magic symbol) ({G} magic symbol) or from your graveyard for its harmonize cost by paying at most ({6} magic symbol) ({G} magic symbol) ({G} magic symbol) ({G} magic symbol) ({G} magic symbol) , searching your library for
Sister Hospitaller and putting it onto the battlefield.
When
Sister Hospitaller enters, it and
Preston trigger.
Resolve the
Sister Hospitaller trigger, returning an applicable target from your graveyard to the battlefield.
Holding priority, activate
Phyrexian Altar by sacrificing
Sister Hospitaller.
Resolve the
Preston trigger, creating a token copy of
Sister Hospitaller that is a 0/1 Illusion.
When the
Sister Hospitaller token enters, it triggers, returning
Sister Hospitaller from your graveyard to the battlefield.
Repeat from step 2.