Activate Phyrexian Altar by sacrificing Gutterbones, adding {B}.
Activate Gutterbones by paying {B}, returning it to your hand.
Desecrated Tomb trigger, creating a 1/1 Bat token.
Activate Phyrexian Altar by sacrificing a Bat token, adding {B}.
Cast Gutterbones by paying {B}.
Repeat

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Embalmer's Tools

Phyrexian Altar

Desecrated Tomb

Gutterbones

Activate Phyrexian Altar by sacrificing Gutterbones, adding {B}.
Activate Gutterbones by paying {B}, returning it to your hand.
Tormod trigger, creating a 2/2 Zombie token.
Activate Phyrexian Altar by sacrificing a Zombie token, adding {B}.
Cast Gutterbones by paying {B}.
Repeat

Infinite death triggers

Tormod, the Desecrator

Cast Gutterbones by paying {B}.
Reflections of Littjara triggers, creating a token copy of Gutterbones.
Activate Phyrexian Altar by sacrificing Gutterbones and the Gutterbones token, adding {2}.
The Gutterboness die, triggering Pitiless Plunderer twice, creating two Treasure tokens.
Activate both Treasure tokens by tapping and sacrificing them, adding {B}{B}.
Activate Gutterbones by paying {1}{B}, returning it from your graveyard to your hand.
Repeat.

Infinite artifact ETB

Infinite artifact LTB

Infinite artifact sacrifice triggers

Infinite artifact tokens

Infinite colorless mana

Infinite creature tokens

Infinite storm count

Infinite colored mana

Infinite Treasure tokens

Reflections of Littjara

Pitiless Plunderer

Cast Gutterbones by paying {B}.
Reflections of Littjara triggers, creating a token copy of Gutterbones.
Activate Ashnod's Altar by sacrificing Gutterbones and the Gutterbones token, adding {C}{C}{C}{C}.
The Gutterboness die, triggering Pitiless Plunderer twice, creating two Treasure tokens.
Activate both Treasure tokens by tapping and sacrificing them, adding {B}{B}.
Activate Gutterbones by paying {1}{B}, returning it from your graveyard to your hand.
Repeat.

Ashnod's Altar

Combos with "Gutterbones"