The Gitrog Monster + Kodama of the East Tree + Dakmor Salvage + Zuran Orb + The Necrobloom
Infinite Mill: Infinite self-mill, Near-infinite lifegain, Near-infinite lifegain triggers, Near-infinite ETB, Near-infinite self-discard triggers, Near-infinite landfall triggers, Near-infinite creature tokens, Near-infinite card draw, Near-infinite draw triggers
Play Dakmor Salvage.
When Dakmor Salvage enters, The Necrobloom and Kodama trigger.
Resolve the Kodama trigger, choosing to put nothing onto the battlefield.
Holding priority, activate Zuran Orb by sacrificing Dakmor Salvage.
The Gitrog Monster's second ability triggers, causing you to mill two cards and return Dakmor Salvage from your graveyard to your hand.
If a land was milled this way, The Gitrog Monster's second ability triggers, causing you to draw a card.
Resolve the Zuran Orb ability
Resolve the The Necrobloom trigger, creating a token.
When the token enters the battlefield, Kodama triggers, putting Dakmor Salvage from your hand onto the battlefield.
When Dakmor Salvage enters the battlefield, The Necrobloom triggers.
Repeat from step 4.
Proceed to your cleanup step, and discard a land and any other card(s) as needed down to your maximum hand size.
The Gitrog Monster triggers, causing you to mill two cards and return a land from your graveyard to your hand.
Repeat, as you will still be over your maximum hand size and will be required to discard again.
Cards: The Gitrog Monster, Kodama of the East Tree, Dakmor Salvage, Zuran Orb, The Necrobloom