Endrek Sahr triggers, creating five 1/1 Thrull creature tokens.
Gray Merchant enters the battlefield, causing each opponent to lose at least four life and you to gain life equal to the life you gained this way.
Activate
Phyrexian Altar six times by sacrificing Gray Merchant and five Thrulls, adding ({3} magic symbol) ({B} magic symbol) ({B} magic symbol) ({B} magic symbol) .
The Thrulls and Grey Merchant die, triggering
Pitiless Plunderer six times, creating six Treasure tokens.
Activate a Treasure token by tapping and sacrificing it, adding ({1} magic symbol) .
Activate
Phyrexian Reclamation by paying ({1} magic symbol) ({B} magic symbol) and two life, returning Gray Merchant from your graveyard to your hand.