Cast Whitemane Lion by paying {1}{W}.
Rin and Seri triggers, creating a 1/1 Dog creature token.
Whitemane Lion enters the battlefield, triggering its ability.
Holding priority, activate Earthcraft by tapping the Dog token, untapping a basic Plains you control.
Activate the Plains by tapping it, adding {W}.
Repeat from step 4 one additional time, tapping Whitemane Lion instead.
Resolve the Whitemane Lion trigger from step 3, returning itself from the battlefield to your hand.
Repeat.

Infinite creature ETB

Infinite creature LTB

Infinite storm count

Infinite tapped creature tokens

Rin and Seri, Inseparable

Earthcraft

Whitemane Lion

Cast Universal Automaton by paying {1}.
Rin and Seri triggers twice, creating a 1/1 Cat and a 1/1 Dog creature token.
Activate Earthcraft by tapping the Cat token, untapping a basic Forest you control.
Activate the Forest by tapping it, adding {G}.
Repeat from step 3 two additional times, tapping the Dog token and Universal Automaton respectively.
Activate Temur Sabertooth by paying {1}{G}, returning Universal Automaton from the battlefield to your hand.
Repeat.

Temur Sabertooth

Universal Automaton

Cast Whitemane Lion by paying its mana cost.
Rin and Seri triggers, creating a 1/1 Dog creature token.
When Whitemane Lion enters, it triggers.
Holding priority, activate Whitemane Lion and the Dog token by tapping them, adding {1}{W}.
Resolve the Whitemane Lion ability, returning it from the battlefield to your hand.
Repeat.

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