Walking Ballista + Unspeakable Symbol + Far Fortune, End Boss + Collective Inferno
Walking Ballista
Unspeakable Symbol
Far Fortune, End Boss
Collective Inferno
Infinite damageInfinite lifegainInfinite lifegain triggersInfinite +1/+1 counters on creatures you control
How it works
Give Walking Ballista lifelink, if needed.
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.
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.