When the land enters the battlefield, it triggers.
Holding priority, activate
Altar of Dementia by sacrificing the land.
When the land dies,
Enduring Renewal triggers, returning the land to your hand from your graveyard.
Resolve the
Altar of Dementia ability, causing target player to mill cards equal to the land's power.
Resolve the land's trigger from step 3, causing you to put the land onto the battlefield from your hand, draw a card, and then decline to put another land onto the battlefield.