Ashaya, Soul of the Wild + Stone-Seeder Hierophant + Serra's Sanctum + Whitemane Lion
Ashaya, Soul of the Wild
Stone-Seeder Hierophant
Serra's Sanctum
Whitemane Lion
Infinite creature LTBInfinite creature ETBInfinite storm countInfinite mana lands you control can produceInfinite green manaInfinite landfall triggersInfinite white manaInfinite untap of nontoken creatures you controlInfinite mana nontoken creatures you control can produceInfinite untap of lands you control
How it works
Activate Serra's Sanctum by tapping it, adding at least .
Cast Whitemane Lion by paying its mana cost.
When Whitemane Lion enters as a land due to Ashaya, it and Stone-Seeder Hierophant trigger.
Resolve the Whitemane Lion trigger, returning it from your graveyard to the battlefield.
Resolve the Stone-Seeder Hierophant trigger, untapping it.
Activate Stone-Seeder Hierophant by tapping it, untapping Serra's Sanctum.