Activate Ashnod's Altar by sacrificing another creature with a +1/+1 counter on it, adding {C}{C}.
The creature dies, triggering Basri's Lieutenant's second ability, creating a 2/2 Knight creature token.
When the Knight enters the battlefield, Serra Redeemer triggers, putting two +1/+1 counters on the Knight.
Repeat.

Infinite colorless mana

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Basri's Lieutenant

Serra Redeemer

Ashnod's Altar

Activate Viscera Seer by sacrificing Lesser Masticore
When Lesser Masticore dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
When Lesser Masticore enters, Serra Redeemer triggers, putting a +1/+1 counter on Lesser Masticore
Resolve the Viscera Seer ability.
Repeat.

Infinite artifact ETB

Infinite artifact LTB

Infinite artifact sacrifice triggers

Infinite scry 1

Viscera Seer

Lesser Masticore

Put a +1/+1 counter on a creature you control.
Animation Module triggers, causing you to pay {1} to create a 1/1 Servo artifact creature token.
When the Servo enters the battlefield, Serra Redeemer triggers, putting two +1/+1 counters on the Servo.
Animation Module triggers, holding priority, activate Ashnod's Altar by sacrificing the Servo, adding {C}{C}.
Resolve the Animation Module trigger, causing you to pay {1} to create a 1/1 Servo artifact creature token.
Repeat from step 3.

Infinite artifact tokens

Infinite creature tokens

Animation Module

Activate Goblin Bombardment by sacrificing another creature with a +1/+1 counter on it.
The creature dies, triggering Basri's Lieutenant's second ability, creating a 2/2 Knight creature token.
When the Knight enters the battlefield, Serra Redeemer triggers, putting two +1/+1 counters on the Knight.
Resolve the Goblin Bombardment ability from step 1, dealing 1 damage to any target.
Repeat.

Infinite damage

Goblin Bombardment

Activate Phyrexian Altar by sacrificing another creature with a +1/+1 counter on it, adding one mana of any color.
The creature dies, triggering Basri's Lieutenant's second ability, creating a 2/2 Knight creature token.
When the Knight enters the battlefield, Serra Redeemer triggers, putting two +1/+1 counters on the Knight.
Repeat.

Infinite colored mana

Phyrexian Altar

Activate Altar of Dementia by sacrificing another creature with a +1/+1 counter on it.
The creature dies, triggering Basri's Lieutenant's second ability, creating a 2/2 Knight creature token.
When the Knight enters the battlefield, Serra Redeemer triggers, putting two +1/+1 counters on the Knight.
Resolve the Altar of Dementia ability from step 1, causing target player to mill cards equal to the sacrificed creature's power.
Repeat.

Infinite mill

Infinite self-mill

Altar of Dementia

Activate Xavier Sal by tapping it and removing a counter from a permanent you control, creating a copy of a creature token you control with base power 2 or less.
When the creature token enters the battlefield, Intruder Alarm and Serra Redeemer trigger.
Resolve the Intruder Alarm trigger, untapping all creatures.
Resolve the Serra Redeemer trigger, putting two +1/+1 counters on the creature token.
Repeat.

Combos with "Serra Redeemer"