Cast Star of Extinction by paying {5}{R}{R}, destroying target land and dealing 20 damage to each creature and each planeswalker.
Toralf triggers for each creature your opponent control that is dealt excess damage this way.
Resolve a Toralf trigger, dealing damage equal to the excess damage to any target.
Repeat step 3 for each remaining trigger.

Near-infinite damage

Toralf, God of Fury // Toralf's Hammer

Star of Extinction

Cast Star of Extinction by paying {5}{R}{R}, destroying target land and dealing 20 damage to each creature and planeswalker.
Wrathful Red Dragon triggers for each Dragon you control.
Resolve the first Wrathful Red Dragon trigger, dealing 20 damage to any non-Dragon target.
Repeat step 3 for each remaining trigger.

Wrathful Red Dragon

Cast Star of Extinction by paying {5}{R}{R}, dealing 20 damage to each creature and planeswalker and destroying a land.
Each Sliver you control triggers, dealing 20 damage to any target for each trigger.

Spiteful Sliver

Cast Star of Extinction by paying {5}{R}{R}, destroying target land, and then dealing 20 damage to each creature and each planeswalker.
For each creature opponents control that is dealt excess damage, Fall of Cair Andros triggers, creating a 0/0 Army if you dont control one, and putting a number of +1/+1 counters on an Army you control equal to the excess damage.

Near-infinite +1/+1 counters on an Army token

Near-infinite damage to all creatures

Fall of Cair Andros

Cast Star of Extinction by paying {5}{R}{R}, destroying a land and dealing 20 damage to each creature and each planeswalker, and causing you to gain life equal to the damage dealt this way due to Soulfire Grand Master.

Near-infinite lifegain

Soulfire Grand Master

Activate Tree of Perdition, exchanging target opponent's life total with Tree of Perdition's toughness.
Cast Star of Extinction for {5}{R}{R}, destroying target land and dealing 20 damage to all creatures and planeswalkers.
Brash Taunter triggers, dealing 20 damage to target opponent.

Target player takes a lethal amount of damage

Tree of Perdition

Brash Taunter

Activate Tree of Perdition targeting the opponent chosen with Stuffy Doll, exchanging their life total with Tree of Perdition's toughness.
Cast Star of Extinction for {5}{R}{R}, destroying target land and dealing 20 damage to all creatures and planeswalkers.
Stuffy Doll triggers, dealing 20 damage to that same opponent.

Stuffy Doll

Activate Tree of Perdition, exchanging target opponent's life total with Tree of Perdition's toughness.
Cast Star of Extinction for {5}{R}{R}, destroying target land and dealing 20 damage to all creatures and planeswalkers.
Boros Reckoner triggers, dealing 20 damage to target opponent.

Boros Reckoner

Activate Tree of Perdition, exchanging target opponent's life total with Tree of Perdition's toughness.
Cast Star of Extinction for {5}{R}{R}, destroying target land and dealing 20 damage to all creatures and planeswalkers.
Spitemare triggers, dealing 20 damage to target opponent.

Spitemare

Activate Tree of Perdition, exchanging target opponent's life total with Tree of Perdition's toughness.
Cast Star of Extinction for {5}{R}{R}, destroying target land and dealing 20 damage to all creatures and planeswalkers.
Truefire Captain triggers, dealing 20 damage to target opponent.

Truefire Captain

Activate Tree of Perdition, exchanging target opponent's life total with Tree of Perdition's toughness.
Cast Star of Extinction for {5}{R}{R}, destroying target land and dealing 20 damage to all creatures and planeswalkers.
Coalhauler Swine triggers, dealing 20 damage to target opponent.

Coalhauler Swine

Cast Star of Extinction by paying {5}{R}{R}.
Holding priority, cast Gatta and Luzzu by paying {2}{W}.
When Gatta and Luzzu enters the battlefield, it triggers, targeting a creature you control.
Resolve Star of Extinction, destroying target land and dealing 20 damage to each creature and each planeswalker. The creature targeted by Gatta and Luzzu will not be dealt damage, and will instead have twenty +1/+1 counters put on it.
At the beginning of your next upkeep, Mayael's Aria triggers, causing you to put a +1/+1 counter on each creature you control, gain 10 life and win the game.

Win the game at the beginning of your next upkeep

Gatta and Luzzu

Mayael's Aria

Give Tephraderm indestructible, if needed.
Cast Star of Extinction by paying {5}{R}{R}.
Hive Mind triggers, causing each opponent to copy Star of Extinction.
Resolve an opponent's Star of Extinction, destroying a land and dealing 20 damage to each creature and planeswalker.
Tephraderm's second ability triggers, dealing 60 damage to the opponent who controlled the Star of Extinction copy due to Fiery Emancipation.
Repeat from step 4 for each remaining Star of Extinction until each opponent loses the game.

Tephraderm

Hive Mind

Fiery Emancipation

Give Tephraderm indestructible, if needed.
Cast Star of Extinction by paying {5}{R}{R}.
Hive Mind triggers, causing each opponent to copy Star of Extinction.
Resolve an opponent's Star of Extinction, destroying a land and dealing 20 damage to each creature and planeswalker.
Tephraderm's second ability triggers, dealing 40 damage to the opponent who controlled the Star of Extinction copy due to The Rollercrusher Ride.
Repeat from step 4 for each remaining Star of Extinction until each opponent loses the game.

The Rollercrusher Ride

Cast Star of Extinction by paying {5}{R}{R}, destroying a land, dealing 20 damage to each creature your opponents control and each planeswalker, and putting twenty +1/+1 counters on each creature you control due to Vigor.
Declare Twenty-Toed Toad as an attacker, triggering its second ability, causing you to win the game.

Win the game

Near-infinite +1/+1 counters

Twenty-Toed Toad

Vigor

Cast Star of Extinction by paying {5}{R}{R}.
Holding priority, cast Gatta and Luzzu by paying {2}{W}.
When Gatta and Luzzu enters the battlefield, it triggers, targeting a creature you control.
Resolve Star of Extinction, destroying target land and dealing 20 damage to each creature and each planeswalker. The creature targeted by Gatta and Luzzu will not be dealt damage, and will instead have twenty +1/+1 counters put on it.
Simic Ascendancy triggers, putting twenty growth counters on it.
At the beginning of your next upkeep, Simic Ascendancy triggers, causing you to win the game.

Combos with "Star of Extinction"