Activate Tooth and Claw by sacrificing two creatures, creating two 3/1 Carnivore creature tokens.
Repeat.

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Tooth and Claw

Parallel Lives

Activate Tooth and Claw by sacrificing two creatures, creating a 3/1 Carnivore and a 1/1 Squirrel creature token.
Repeat.

Chatterfang, Squirrel General

Activate Tooth and Claw by sacrificing two other creatures, creating a 3/1 Carnivore and a 1/1 Soldier creature token.
Repeat.

Queen Allenal of Ruadach

Activate Tooth and Claw by sacrificing a non-Spirit creature and any additional creature.
Requiem Angel triggers at least once, creating at least one 1/1 Spirit creature token with flying.
Resolve Tooth and Claw's ability, creating a 3/1 creature token named Carnivore.
Repeat.

Requiem Angel

Activate Tooth and Claw by sacrificing two additional creatures, creating a 3/1 Carnivore creature token and either a 2/2 Cat or 3/1 Dog creature token due to Peregrin Took and Jinnie Fay.
Repeat.

Jinnie Fay, Jetmir's Second

Peregrin Took

Activate Tooth and Claw by sacrificing two creatures, creating a 3/1 Carnivore creature token, a Food token and a 1/1 Thopter artifact creature token.
Repeat.

Infinite card draw

Infinite draw triggers

Infinite Food tokens

Stridehangar Automaton

Activate Tooth and Claw by sacrificing two creatures.
When the creatures die, Pitiless Plunderer triggers twice, creating two Treasure tokens and two 1/1 Thopter artifact creature tokens.
Resolve the Tooth and Claw ability, creating a 3/1 Carnivore creature token.
Repeat.

Infinite colored mana

Infinite creature tokens

Infinite Treasure tokens

Pitiless Plunderer

Activate Tooth and Claw by sacrificing two creatures.
When the creatures die, Pitiless Plunderer triggers twice, creating two Treasure tokens.
Resolve the Tooth and Claw ability, creating a 3/1 Carnivore creature token.
Activate the Treasures by tapping and sacrificing them, adding {1}{G}.
Activate Ant Queen by paying {1}{G}, creating a 1/1 Insect creature token.
Repeat.

Ant Queen

Activate Tooth and Claw by sacrificing two additional creatures.
When the creatures die, Pitiless Plunderer triggers twice, creating a Treasure artifact token and either a 2/2 Cat or 3/1 Dog creature token due to Jinnie Fay.
Resolve the Tooth and Claw ability, creating a 3/1 Carnivore creature token.
Repeat.
You may optionally replace both of Pitiless Plunderer's triggers with creating Cat or Dog tokens to get infinite creature tokens.

Infinite creature tokens with haste

Activate Tooth and Claw by sacrificing two creatures.
When the creatures die, Pitiless Plunderer triggers twice, creating two Treasure tokens.
Resolve the Tooth and Claw ability, creating a 3/1 Carnivore creature token.
Activate the Treasures by tapping and sacrificing them, adding {2}.
Activate Sliver Queen by paying {2}, creating a 1/1 Sliver creature token.
Repeat.

Combos with "Tooth and Claw"