Cultist Organ

Indestructible
When Cultist Organ enters the battlefield, and
at the beginning of each upkeep, put a Medley
counter on it and create two 2/2 black and red Rahgthasi Servant creature tokens. Then, if there
are five Medley counters on Cultist Organ,
transform it and sacrifice all Rahgthasi Servants
you control.
(You may have this artifact in your command zone
if your commander is Nyris, Rahgthasi's Messenger.)
Transforms into Rahgthasi, Hellstorm