Activate Corpse Blockade's ability by sacrificing Gravecrawler, Corpse Blockade gains deathtouch until end of turn.
Cast Gravecrawler from your graveyard by paying {0}.
Repeat.

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Infinite storm count

Gravecrawler

Rooftop Storm

Corpse Blockade

Activate Corpse Blockade by sacrificing Nether Traitor.
Sek'Kuar triggers, creating a 3/1 Graveborn creature token creature with haste.
Resolve the Corpse Blockade ability, giving it deathtouch until end of turn.
Activate the Graveborn token using the ability from Cryptolith Rite by tapping it, adding {B}.
Activate Corpse Blockade by sacrificing the Graveborn token.
Nether Traitor triggers, causing you to pay {B} to return it from your graveyard to the battlefield.
Resolve the Corpse Blockade ability, giving it deathtouch until end of turn.
Activate Nether Traitor using the ability from Cryptolith Rite by tapping it, adding one mana of any color.
Repeat.

Combos with "Corpse Blockade"