Karlov of the Ghost Council + Animation Module + Ajani's Welcome + Ashnod's Altar

Prerequisites

• You have a way to cause a creature to enter the battlefield under your control.

Steps

1. 1Cause a creature to enter the battlefield under your control.
2. 2Ajani's Welcome triggers, causing you to gain 1 life.
3. 3Karlov triggers, putting two +1/+1 counters on itself.
4. 4Animation Module triggers, causing you to pay to create a 1/1 Servo artifact creature token.
5. 5The Servo enters the battlefield, triggering Ajani's Welcome.
6. 6Holding priority, activate Ashnod's Altar by sacrificing the Servo, adding .
7. 7Resolve the Ajani's Welcome trigger, causing you to gain 1 life.
8. 8Repeat from step 3.

Effects

• Infinite +1/+1 counters on a creature
• Infinite colorless mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite creature tokens
• Infinite death triggers
• Infinite lifegain
• Infinite lifegain triggers