Activate Viscera Seer by sacrificing Reassembling Skeleton.
When Reassembling Skeleton dies, Pitiless Plunderer triggers twice, creating two Treasure tokens.
Resolve the Viscera Seer ability.
Activate the Treasure tokens by tapping and sacrificing them, adding {1}{B}.
Activate Reassembling Skeleton by paying {1}{B}, returning it from your graveyard to the battlefield tapped.
Repeat.

Infinite LTB

Infinite ETB

Infinite sacrifice triggers

Infinite death triggers

Infinite scry 1

Pitiless Plunderer

Reassembling Skeleton

Viscera Seer

The Masamune

Cast Saw in Half by paying {2}{B}, destroying Mondrak and creating two token copies of it with base power equal to half the destroyed creature's power and base toughness equal to half the destroyed creature's toughness, rounding up each time.
Put either Mondrak token into your graveyard due to the legend rule.
Ratadrabik triggers four times from the nontoken and token Mondraks dying.
Resolve the first trigger, creating 2^X nonlegendary token copies of Mondrak that are 2/2 Zombies, where X is the number of Mondraks you control.
Repeat step 4 for the remaining triggers.

Near-infinite ETB

Near-infinite creature tokens

Near-infinite token doubling

Ratadrabik of Urborg

Saw in Half

Mondrak, Glory Dominus

Cast Ebondeath from your graveyard by paying {B}{B}.
When Ebondeath enters, The Sibsig Ceremony triggers, destroying Ebondeath and creating a 2/2 Zombie Druid creature token.
When Ebondeath dies, Pitiless Plunderer triggers twice, creating two Treasure tokens.
Activate two Treasures by tapping and sacrificing them, adding {B}{B}.
Repeat.

Infinite storm count

Infinite creature tokens

The Sibsig Ceremony

Ebondeath, Dracolich

Combos with "The Masamune"