Walking Ballista + Unspeakable Symbol + Insult // Injury + Collective Inferno

Walking Ballista

Unspeakable Symbol

Insult // Injury

Collective Inferno

How it works

1. Give Walking Ballista lifelink, if needed.
2. Cast Injury by paying 2.
3. If 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.
4. Activate 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.
5. Repeat from step 3.