Combos with Collective Inferno

1. Cast Malignus by paying {3}{R}{R}. It'll enter with power equal to half the highest life total among your opponents, rounded up.
2. When Malignus enters, Champion of the Path triggers, causing Malignus to deal damage equal to its power doubled to each opponent due to Collective Inferno.

Activate Heartless Hidetsugu by tapping it, dealing damage to each opponent equal to half their life total, rounded down, times 2, and dealing no damage to you due to Pariah's Shield.

Activate Heartless Hidetsugu by tapping it, dealing damage to each opponent equal to half their life total, rounded down, times 2, and dealing no damage to you due to Pariah.

1. Cast Gideon's Sacrifice by paying {W}.
2. Activate Heartless Hidetsugu by tapping it, dealing damage to each opponent equal to half their life total, rounded down, times 2, and dealing no damage to you due to Gideon's Sacrifice.

1. Cast Martyrdom by paying {1}{W}{W}, targeting Phyrexian Vindicator.
2. Activate Phyrexian Vindicator by paying {0}, targeting a creature.
3. Attempt to deal damage to the targeted creature. The damage will then be increased due to Collective Inferno, then redirected to Phyrexian Vindicator, which is then redirected back to the creature that was originally targeted.
4. Holding priority, activate Phyrexian Vindicator by paying {0}, targeting the creature.
5. Repeat step 4 until all damage will be redirected to Phyrexian Vindicator.
6. Repeat from step 3.

Activate Heartless Hidetsugu by tapping it, dealing damage to each opponent equal to half their life total, rounded down, times 2, and dealing no damage to you due to With Great Power....

1. Activate Deathless Angel twice by paying {W}{W}{W}{W}, giving two creatures an opponent controls indestructible until end of turn.
2. Deal noncombat damage to one of the indestructible creatures, dealing an increased amount of damage instead due to Collective Inferno.
3. Toralf triggers, dealing an amount of damage over the excess damage to the second indestructible creature due to Collective Inferno.
4. Toralf triggers, dealing an amount of damage over the excess damage to the first indestructible creature due to Collective Inferno.
5. Repeat from step 3 an arbitrarily large number of times.
6. Resolve a Toralf trigger, dealing infinite damage to any target.

1. Give Walking Ballista lifelink, if needed.
2. 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.
3. 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.
4. Repeat from step 2.

1. Give Walking Ballista lifelink, if needed.
2. 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.
3. 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.
4. Repeat from step 2.

1. Give Walking Ballista lifelink, if needed.
2. 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.
3. 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.
4. Repeat from step 2.

1. Give Walking Ballista lifelink, if needed.
2. 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.
3. 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.
4. Repeat from step 2.

1. Give Walking Ballista lifelink, if needed.
2. 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.
3. 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.
4. Repeat from step 2.

1. Give Walking Ballista lifelink, if needed.
2. 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.
3. 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.
4. Repeat from step 2.

1. Give Walking Ballista lifelink, if needed.
2. 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.
3. 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.
4. Repeat from step 2.

1. Give Walking Ballista lifelink, if needed.
2. Cast Injury by paying {2}{R}.
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.