Declare Genestealer Patriarch and Leech Bonder as attackers.
Genestealer Patriarch's first ability triggers, putting an infection counter on a creature an opponent controls.
Activate Leech Bonder by paying {U} and untapping it, moving the infection counter from the opponent's creature onto another creature you control.
Activate Ashnod's Altar by sacrificing the creature with an infection counter on it, adding {C}{C}.
The creature dies, triggering Resourceful Defense and Genestealer Patriarch's second ability.
Resolve the Resourceful Defense trigger, putting an infection counter onto another creature you control.
Resolve the Genestealer Patriarch trigger, causing you to create a token copy of the sacrificed creature that is a Tyranid in addition to its other types.
Repeat from step 4.

Infinite colorless mana

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Genestealer Patriarch

Resourceful Defense

Leech Bonder

Ashnod's Altar

Declare Genestealer Patriarch and Leech Bonder as attackers.
Genestealer Patriarch's first ability triggers, putting an infection counter on a creature an opponent controls.
Activate Leech Bonder by paying {U} and untapping it, moving the infection counter from the opponent's creature onto another creature you control.
Activate Phyrexian Altar by sacrificing the creature with an infection counter on it, adding one mana of any color.
The creature dies, triggering Resourceful Defense and Genestealer Patriarch's second ability.
Resolve the Resourceful Defense trigger, putting an infection counter onto another creature you control.
Resolve the Genestealer Patriarch trigger, causing you to create a token copy of the sacrificed creature that is a Tyranid in addition to its other types.
Repeat from step 4.

Infinite colored mana

Phyrexian Altar

Declare Genestealer Patriarch as an attacker.
Genestealer Patriarch's first ability triggers, putting an infection counter on a creature an opponent controls.
Cast Fate Transfer by paying {1}{U/B}, moving the infection counter from the opponent's creature onto another creature you control.
Activate Ashnod's Altar by sacrificing the creature with an infection counter on it, adding {C}{C}.
The creature dies, triggering Resourceful Defense and Genestealer Patriarch's second ability.
Resolve the Resourceful Defense trigger, putting an infection counter onto another creature you control.
Resolve the Genestealer Patriarch trigger, causing you to create a token copy of the sacrificed creature that is a Tyranid in addition to its other types.
Repeat from step 4.

Fate Transfer

Declare Genestealer Patriarch as an attacker.
Genestealer Patriarch's first ability triggers, putting an infection counter on a creature an opponent controls.
Cast Fate Transfer by paying {1}{U/B}, moving the infection counter from the opponent's creature onto another creature you control.
Activate Phyrexian Altar by sacrificing the creature with an infection counter on it, adding one mana of any color.
The creature dies, triggering Resourceful Defense and Genestealer Patriarch's second ability.
Resolve the Resourceful Defense trigger, putting an infection counter onto another creature you control.
Resolve the Genestealer Patriarch trigger, causing you to create a token copy of the sacrificed creature that is a Tyranid in addition to its other types.
Repeat from step 4.

Combos with "Genestealer Patriarch"