Walking Ballista + Unspeakable Symbol + Furnace of Rath + Tor Wauki the Younger

Prerequisites

• You have a way to give Walking Ballista lifelink.
• Walking Ballista has at least two +1/+1 counters on it, or your life total is at least 4.

Steps

1. 1Give Walking Ballista lifelink, if needed.
2. 2If Walking Ballista has less than two +1/+1 counters on it, activate Unspeakable Symbol by paying 3 life, putting a +1/+1 counter on Walking Ballista.
3. 3Activate Walking Ballista's second ability by removing a +1/+1 counter from it, dealing 4 damage to an opponent or a permanent an opponent controls, and causing you to gain 4 life.
4. 4Repeat from step 2.

Effects

• Infinite +1/+1 counters on creatures you control
• Infinite damage
• Infinite lifegain
• Infinite lifegain triggers