Cast Peer into the Abyss by paying {4}{B}{B}{B}, causing an opponent to draw cards equal to half their library and causing them to lose half their life total, rounded up.
Razorkin Needlehead triggers for each card drawn this way.
Resolve the first trigger, dealing 1 damage to the opponent.
If the opponent has 0 or less life, the opponent loses the game due to having zero or less life.
Repeat from step 3 for each remaining trigger and/or until the opponent loses the game.

Near-infinite damage to one opponent

Near-infinite draw triggers for target opponent

Near-infinite card draw for target opponent

Near-infinite lifeloss for target opponent

Razorkin Needlehead

Peer into the Abyss

Cast Windfall by paying {2}{U}, causing each player to discard their hand and then draw a number of cards equal to the greatest number of cards a player discarded this way.
Razorkin Needlehead triggers for each card drawn this way, giving each opponent a poison counter for each card they drew.
Each opponent loses the game due to having ten or more poison counters

Each opponent loses the game

Windfall

Phyresis

Cast Echo of Eons by paying {4}{U}{U}, causing each player to discard their hands and draw seven cards.
Razorkin Needlehead triggers for each card your opponents draw.
Resolve the first trigger, causing the opponent to get a poison counter.
If the opponent has ten or more poison counters, they lose the game as a state-based action.
Repeat from step 3 for each remaining trigger.
If needed, cast Echo of Eons from your graveyard for its flashback cost by paying {2}{U}, causing each player to discard their hands and draw seven cards.
Repeat from step 2.

Echo of Eons

Cast Harmless Offering by paying {2}{R}, giving control of Vilis to an opponent.
During that opponent's draw step, they draw a card.
Razorkin Needlehead triggers, dealing 1 damage to the opponent.
Vilis triggers, causing the opponent to draw a card.
Repeat from step 3 until the opponent loses the game either due to drawing from an empty library, or from having 0 life.

Target opponent loses the game

Infinite card draw for target opponent

Infinite draw triggers for target opponent

Vilis, Broker of Blood

Harmless Offering

Cast Enter the Infinite by paying {8}{U}{U}{U}{U}.
Hive Mind triggers, causing each opponent to copy Enter the Infinite.
Resolve the first opponent's Enter the Infinite, causing the opponent to draw their library, and then put a card on top of their library.
Razorkin Needlehead triggers for each card they draw this way, dealing damage to the opponent equal to the number of cards they drew.
If the opponent has 0 or less life, they lose the game.
Repeat step 3 for each other opponent.

Near-infinite damage

Infinite draw triggers for all players

Infinite card draw for all players

Hive Mind

Enter the Infinite

At the beginning of an opponent's upkeep, Assault Suit triggers, giving them control of Vilis.
During that player's next draw step, they draw a card.
Razorkin Needlehead triggers, dealing 1 damage to that opponent.
Vilis triggers, causing the opponent to draw a card.
Repeat from step 3 until the opponent loses the game either due to drawing from an empty library or by having a life total of 0.
When the opponent loses the game, you regain control of Vilis.
Repeat from step 1 for each remaining opponent.

Combos with "Razorkin Needlehead"