Activate Viscera Seer by sacrificing Matter Reshaper
When Matter Reshaper dies, it and Mortuary trigger.
Resolve the Mortuary trigger, putting Matter Reshaper from your graveyard onto the top of your library 
Resolve the Matter Reshaper trigger, revealing Matter Reshaper from the top of your library and putting it onto the battlefield.
Resolve the Viscera Seer ability.
Repeat.

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Infinite scry 1

Matter Reshaper

Mortuary

Viscera Seer

Sacrifice Matter Reshaper to Phyrexian Altar, adding {B}.
With Matter Reshaper's trigger on the stack, activate Haunted Crossroads by paying {B}, putting Matter Reshaper from your graveyard on top of your library.
Resolve Matter Reshaper's trigger, revealing Matter Reshaper on top of your library, and putting it on the battlefield.
Repeat.

Phyrexian Altar

Haunted Crossroads

Combos with "Matter Reshaper"