Whenever damage would be dealt to you, With Great Power... causes that damage to be redirected to Anti-Venom.
Anti-Venom will then prevent the damage and put that many +1/+1 counters on it instead.

Prevent all damage that would be dealt to you

Anti-Venom, Horrifying Healer

With Great Power...

Deal damage to Stuffy Doll, either using its ability or another method.
Stuffy Doll triggers, attempting to deal damage to you, but dealing damage to Stuffy Doll instead due to With Great Power....
Repeat step 2 in an infinite loop, causing the game to end in a draw.

Draw the game

Stuffy Doll

Whenever damage would be dealt to you, With Great Power... causes that damage to be redirected to the creature it is attached to.
Since Caduceus grants an ability to the creature preventing damage being dealt to it, no damage is dealt to you or to that creature.

Caduceus, Staff of Hermes

Cast Arcbond by paying {2}{R}, targeting the indestructible creature with With Great Power... attached.
Deal damage to the indestructible creature.
The creature triggers, dealing that much damage to each other creature and each player, with the damage that would be dealt to you instead being dealt to the indestructible creature due to With Great Power....
Repeat step 3.

Infinite damage

Arcbond

Deal damage to Brash Taunter.
Brash Taunter and Fiendlash trigger.
Resolve the Brash Taunter trigger, dealing damage to an applicable target.
Resolve the Fiendlash trigger, targeting you, but dealing damage to Brash Taunter instead due to With Great Power....
Repeat from step 2.

Infinite damage to target opponent

Fiendlash

Brash Taunter

When damage would be dealt to you, that damage is redirected to the creature that has With Great Power... attached instead.
Because Rune-Tail's Essence prevents damage being dealt to creatures you control, the creature with With Great Power... attached takes no damage.

Prevent all damage that would be dealt to creatures you control

Rune-Tail, Kitsune Ascendant // Rune-Tail's Essence

Deal damage to Coalhauler Swine.
Coalhauler Swine triggers, dealing that much damage to each player. Any damage that would be dealt to you is instead dealt to Coalhauler Swine due to With Great Power....
Repeat step 2.

Coalhauler Swine

Deal damage to Brash Taunter.
Brash Taunter and Repercussion trigger.
Resolve the Brash Taunter trigger, dealing damage to an applicable target.
Resolve the Repercussion trigger, dealing damage to Brash Taunter instead of you due to With Great Power....
Repeat from step 2.

Repercussion

Whenever damage would be dealt to you, With Great Power... causes that damage to be redirected to the creature it's attached to.
Vigor will then prevent the damage and put that many +1/+1 counters on that creature instead.

Vigor

Cast Wheel of Misfortune by paying {2}{R}, choosing an arbitrarily large number and having Wheel of Misfortune deal that much damage to Brash Taunter instead of you due to With Great Power... if you chose the largest number.
Brash Taunter triggers, dealing that much damage to an applicable target.

Near-infinite damage to target opponent

Wheel of Misfortune

Cast Volcano Hellion by paying {2}{R}{R}.
When Volcano Hellion enters, it triggers, dealing an arbitarily large amount of damage to you and a creature. The damage that would be dealt to you is dealt to Brash Taunter instead due to With Great Power....
Brash Taunter triggers, dealing an arbitrarily large amount of damage to an applicable target.

Volcano Hellion

Deal damage to Jackal Pup.
Jackal Pup triggers, attempting to deal damage to you, but dealing damage to Jackal Pup instead due to With Great Power....
Repeat step 2 in an infinite loop, causing the game to end in a draw.

Jackal Pup

Activate Heartless Hidetsugu by tapping it, dealing damage to each opponent equal to 1.5 times their life total, and dealing no damage to you due to With Great Power....

Near-infinite damage

Each opponent loses the game

Heartless Hidetsugu

Fiery Emancipation

Activate Firedrinker Satyr by paying {1}{R}, attempting to deal 1 damage to you, but dealing 1 damage to Firedrinker Satyr instead due to With Great Power....
Firedrinker Satyr triggers, attempting to deal 1 damage to you, but dealing 1 damage to Firedrinker Satyr instead due to With Great Power....
Repeat step 2 in an infinite loop, which causes the game to end in a draw.

Firedrinker Satyr

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....

Combos with "With Great Power..."