Activate Sokenzan's second ability by paying {R} and discarding it.
Turntimber Sower triggers, creating two 0/1 Plant creature tokens.
Resolve the Sokenzan ability, creating four 1/1 Spirit creature tokens.
Activate Phyrexian Altar by sacrificing two creatures, adding {R}{G}.
Activate Turntimber Sower by paying {G} and sacrificing three creatures, returning Sokenzan from your graveyard to your hand.
Repeat.

Infinite colored mana

Infinite creature tokens

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Turntimber Sower

Sokenzan, Crucible of Defiance

Phyrexian Altar

Doubling Season

Primal Vigor

Activate Sokenzan's second ability by paying {R} and discarding it.
Turntimber Sower triggers, creating a 0/1 Plant and a 1/1 Squirrel creature token.
Resolve the Sokenzan ability, creating two 1/1 Spirit and two 1/1 Squirrel creature tokens.
Activate Phyrexian Altar by sacrificing two creatures, adding {R}{G}.
Activate Turntimber Sower by paying {G} and sacrificing three creatures, returning Sokenzan from your graveyard to your hand.
Repeat.

Combos with "Sokenzan, Crucible of Defiance"