Lands you control can tap to produce at least ({3} magic symbol) ({G} magic symbol) .
You control a Plains.
Steps
Activate any number of lands by tapping them, adding at least ({3} magic symbol) ({G} magic symbol) .
Activate
Coastal Hornclaw by sacrificing a land.
Repeat step 2 until you control no lands.
Activate
Aftermath Analyst by paying ({3} magic symbol) ({G} magic symbol) and sacrificing it, returning all lands from your graveyard to the battlefield untapped due to
Spelunking.
When the lands enter,
Emeria Shepherd triggers that many times.
Resolve an
Emeria Shepherd trigger that was triggered by a Plains, returning
Aftermath Analyst from your graveyard to the battlefield.
Resolve all other
Emeria Shepherd triggers, returning any number of nonland permanents from your graveyard to either your hand or the battlefield.
Repeat.
Notes
You can return all nonland permanents in your graveyard to the battlefield if you control two or more Plains. To do this, have all triggers from
Emeria Shepherd target desired permanents. Then, resolve the Plains triggers first to return those cards to the battlefield, causing all other triggers to fizzle on the stack.
Results
Infinite LTB.
Infinite ETB.
Infinite sacrifice triggers.
Infinite death triggers.
Infinite landfall triggers.
Return all nonland permanents from your graveyard to the battlefield.