Rin and Seri, Inseparable, Earthcraft, and Whitemane Lion

Prerequisites

• Rin and Seri, Inseparable on the battlefield
• Earthcraft on the battlefield
• Whitemane Lion in hand
• You control a basic Plains
• available

Steps

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

Results

• Infinite creature tokens
• Infinite ETB
• Infinite LTB
• Infinite storm count
• Infinite tap triggers
• Infinite mana basic lands you control can produce
• Infinite untap of basic lands you control